Systematic review of consistency between adherence to cardiovascular or diabetes medication and health literacy in older adults

Relationship Between Health Literacy, Quality of Life, and Treatment Adherence in Patients with Acute Coronary Syndrome

BACKGROUND

Acute coronary syndrome is a significant global health concern that can affect patients' health outcomes and quality of life. In addition, adherence to treatment and health literacy can affect health outcomes.

OBJECTIVE

This study aimed to investigate the relationship between treatment adherence, health literacy, and quality of life among patients with acute coronary syndrome.

METHODS

This cross-sectional study was conducted on 407 patients in Iran from April 2019 to November 2019. Patients were selected by convenience sampling method. Data were collected using demographic questionnaire, World Health Organization Quality of Life Brief Version, Adherence to Treatment Questionnaire, and Health Literacy for Iranian Adults questionnaire. SPSS 25 was used for statistical analysis.

RESULTS

Based on descriptive statistics in this study, most of the participants had good treatment adherence level (56.5%); 28.7% of the participants had insufficient health literacy level. The mean score of quality of life was 51.41 ± 12.03, which was greater than the midpoint of the questionnaire. Furthermore, Pearson's correlation coefficient showed a negative association between health literacy, treatment adherence (r = -0.167, p < .01), and quality of life (r = -0.153, p < .01), and a positive association between treatment adherence and quality of life (r = 0.169, p < .01).

CONCLUSION

The results of the current study showed a negative relationship between health literacy, quality of life, and treatment adherence among patients with acute coronary syndrome. [HLRP: Health Literacy Research and Practice. 2023;7(2):e71-e79.].

Association between health literacy and medication adherence in chronic diseases: a recent systematic review

BACKGROUND

Poor medication adherence is a serious barrier to successful chronic disease management. Previous reviews reported that low health literacy could be associated with medication non-adherence but conclusions were uncertain.

AIM

The aim of this systematic review was to clarify the relationship between health literacy and medication adherence in adults with chronic diseases. A secondary objective was to identify the factors that influence medication adherence.

METHOD

Publications analyzing the relationship between health literacy and adherence in adults with chronic diseases were identified through 6 databases between 2015 and 2020. A quality assessment was conducted in order to improve the interpretation of the relationship between health literacy and medication adherence. A narrative synthesis was then performed to describe the relationship between health literacy and medication adherence. The factors influencing medication adherence were then analyzed as a secondary outcome.

RESULTS

Among the 27 studies, 17 and 10 were considered to be of good and medium methodological quality, respectively. Concerning the relationship between health literacy and adherence, 14 reported a positive relationship, 1 study suggested a negative relationship, 3 found mixed results, and 9 reported not finding a relationship. Patient-related factors such as medication beliefs, self-efficacy, or medication knowledge, as well as demographic factors such as ethnic minority and incomes influence medication adherence.

CONCLUSION

The present review confirms an unclear relationship between health literacy and medication adherence. Although health literacy plays a substantial role in medication adherence, other factors must be taken into account when addressing non-adherence.

The importance of health literacy for self-management: A scoping review of reviews

OBJECTIVES

Self-management of chronic diseases is rather complex, especially for patients with limited health literacy. In this review, we aim to disentangle the specific difficulties patients with limited health literacy face in relation to self-management and their associated needs with respect to self-management support.

METHODS

We performed a literature search in five databases. We used a broad definition of health literacy and self-management was categorized into four types of activities: medical management, changing lifestyle, communicating and navigating through the health care system and coping. Included reviews described the relationship between health literacy and different domains of self-management and were published after 2010.

RESULTS

A total of 28 reviews were included. Some clear difficulties of patients with limited health literacy emerged, predominantly in the area of medical management (especially adherence), communication and knowledge. Other associations between health literacy and self-management were inconclusive. Barriers from the patients' perspective described mainly medical management and the communication and navigation of the health care system.

DISCUSSION

Patients with limited health literacy experience difficulties with specific domains of self-management. For a better understanding of the relationship between health literacy and self-management, a broader conceptualization of health literacy is warranted, including both cognitive and behavioural aspects.

Self-reported health literacy and medication adherence in older adults: a systematic review

OBJECTIVES

To give an overview over the associations between self-reported health literacy and medication adherence in older adults.

DESIGN

A systematic literature review of quantitative studies published in English and German.

DATA SOURCES

MEDLINE via PubMed, CINAHL, Cochrane Library, Epistemonikos and LIVIVO were searched.

ELIGIBILITY CRITERIA

Included studies had to examine the associations between self-reported health literacy and medication adherence in the elderly (samples including ≥66% of ≥60 years old) and had to use a quantitative methodology and had to be written in English or German.

DATA EXTRACTION AND SYNTHESIS

All studies were screened for inclusion criteria by two independent reviewers. A narrative synthesis was applied to analyse all included studies thematically. Quality assessment was conducted using the NIH Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies.

RESULTS

We found 2313 studies, of which nine publications from eight studies were included in this review. Five studies reported a majority of participants with limited health literacy, one study reported a majority of participants with adequate health literacy, and three publications from two studies only reported mean levels of health literacy. Eight publications from seven studies used self-reports to measure medication adherence, while one study used the medication possession ratio. Overall, six publications from five studies reported significantly positive associations between health literacy and medication adherence while two studies reported positive but non-significant associations between both constructs and one study reported mixed results.

CONCLUSION

In this review, associations between self-reported health literacy and medication adherence are rather consistent, indicating positive associations between both constructs in older adults. However, concepts and measures of health literacy and medication adherence applied in the included studies still show a noteworthy amount of heterogeneity (eg, different use of cutoffs). These results reveal the need for more differentiated research in this area.

PROSPERO REGISTRATION NUMBER

CRD42019141028.

Factors influencing diabetes self-management in adults: an umbrella review of systematic reviews

OBJECTIVE

The objective of this review was to identify and describe the factors influencing diabetes self-management in adults by summarizing the available evidence concerning their types, categories, and relative importance.

INTRODUCTION

A wide range of factors, acting simultaneously, influence diabetes self-management and interfere with its actual application by patients. There is a variety of systematic reviews of these factors; however, a more thorough examination of their influences was lacking.

INCLUSION CRITERIA

Systematic reviews of qualitative or quantitative literature focusing on factors influencing adult diabetes self-management in general or on individual behaviors (ie, management of oral antidiabetic medication and insulin injections, self-monitoring of blood glucose, foot care, healthy eating, regular exercise, and smoking cessation) will be included.

METHODS

We performed an extensive search of 11 bibliographic databases, including gray literature, up to June 2019. Quantitative and qualitative findings were summarized separately and labeled according to their types (eg, facilitator/barrier, strength and direction of association), categories (eg, demographic, social), and frequency of occurrence.

RESULTS

We identified 51 types of factors within 114 systematic reviews, which mostly addressed medication-taking behavior. Thirty-two (62.7%) factors were reported in both qualitative and quantitative literature. The predominant influences were psychological factors and behavioral attributes/skills factors. The most frequently reported facilitators of diabetes self-management were motivation to diabetes self-management, a favorable attitude to diabetes self-management, knowledge about the disease, medication and behaviors associated with diabetes self-management, skills, and self-efficacy/perceived behavioral control. The predominant barriers were the presence of depression, and polypharmacy or drug regimen complexity. The demographic factor of female sex was frequently reported for its negative influence on diabetes self-management, whereas older age was a positive factor. The social/cultural and physical environment were the least-studied categories. Other factors such as social support from family, friends, or networks; interventions led by health professionals; and a strong community environment with good social services favoring diabetes self-management were reported as major facilitators of diabetes self-management.

CONCLUSIONS

Essential components of interventions to promote effective diabetes self-management should aim to help adults manage the effects of specific factors related to their psychological and practical self-management experience. Screening for depression, in particular, should become an integral part of the support for adult diabetes self-management, as depression is a particular obstacle to the effectiveness of diabetes self-management. Future studies should more deeply examine the influence of factors identified in the sociocultural and physical environment categories. Research should properly consider and invest efforts in strengthening social support and innovative community care approaches, including pharmacist- and nurse-led care models for encouraging and improving adult diabetes self-management. Finally, researchers should examine non-modifiable factors - age, sex, or socioeconomic status - in the light of factors from other categories in order to deepen understanding of their real-world patterns of action on adult diabetes self-management.

SYSTEMATIC REVIEW REGISTRATION NUMBER

PROSPERO CRD42018084665.

How does health literacy affect the utilization of basic public health services in Chinese migrants?

Previous studies have focused on the determinants of basic public health services utilization, such as socioeconomic status and mobility characteristics, rather than on health literacy. Thus, this study aimed to estimate the effect of health literacy on the utilization of basic public health services among Chinese migrants. Based on the 2016 China Migrants Dynamic Survey data (N = 2335), this study used propensity score matching approach to estimate the effect of health literacy on the utilization of basic public health services, including the establishment of health records and receipt of health education, and to explore heterogeneity in this effect based on educational attainment and urban-rural status. The findings show that high levels of health literacy increased the probability of establishing health records and receiving more health education. Also, high levels of health literacy had a positive effect on the utilization of basic public health services among Chinese migrants, especially those with less education or living in urban areas. Policy makers should more carefully consider the actual situation and needs of migrants who are living in urban areas or have less education, constructing more targeted service programs.

Treatment selection and medication adherence for stable angina: The role of area-based health literacy

RATIONALE, AIMS, AND OBJECTIVES

Clinical studies show equivalent health outcomes from interventional procedures and treatment with medication only for stable angina patients. However, patients may be subject to overuse or access barriers for interventional procedures and may exhibit suboptimal adherence to medications. Our objective is to evaluate whether community-level health literacy is associated with treatment selection and medication adherence patterns.

METHOD

The sample included Medicare fee-for-service beneficiaries (20% random sample) with stable angina in 2007-2013. We used an area-level health literacy variable because of the lack of an individual measure in claims. We measured the association between (a) area-based health literacy with treatment selection (medication only, percutaneous coronary intervention [PCI], or coronary artery bypass grafting (CABG) surgery) and (b) area-based health literacy with medication adherence. We controlled for other factors including demographics, co-morbidity burden, dual eligibility, and area deprivation index.

RESULTS

We identified 8300 patients of whom 8.7% lived in a low health literacy area. Overall, 56% of patients received medication only, 28% received PCI, and 15% received CABG. Patients in low health literacy areas were less likely to receive CABG (-3.5 percentage points; 95% CI, -6.8 to -0.3) than were patients in high health literacy areas, but the significance was sensitive to specification. Overall, 81.5% and 71.5% of patients were adherent to antianginals and statins, respectively. Living in low health literacy areas was associated with lower adherence to antianginals (-3.3 percentage points; 95% CI, -6.1 to -0.6) but not statins.

CONCLUSIONS

Low area-based health literacy was associated with being less likely to receive CABG and lower adherence, but the differences between low and high health literacy areas were small and sensitive to model specification. Individual factors such as dual eligibility status and race/ethnicity had stronger associations with outcomes than had area-based health literacy, suggesting that this area-based measure was inadequate to account for social determinants in this study.

Patient perspectives of nuisance bleeding and adherence to dual antiplatelet therapy: a qualitative study

OBJECTIVE

To understand the experiences of patients with dual antiplatelet therapy (DAPT) and nuisance bleeding, and their perspectives of the impact of nuisance bleeding on medication adherence and information seeking.

METHODS

We conducted focus groups with patients who had undergone percutaneous coronary intervention, coronary artery bypass graft and conservatively managed acute coronary syndrome patients. Two focus groups were with patients at the early stages of treatment (0-3 months), and two with patients coming to the end of treatment (9-12 months). Group discussions were audio recorded, and recordings were transcribed verbatim, anonymised and analysed using framework analysis.

FINDINGS

Nine patients taking DAPT for up to 3 months, and 12 taking DAPT between 9 and 12 months participated in the focus groups. We found that: (1) participants adhered to treatment when they believed DAPT was important to health outcomes; (2) those who experienced nuisance bleeding reported symptoms to be mild and manageable; (3) participants' and their family's understanding of DAPT risks and benefits, and their ability to manage symptoms, influenced perspectives of and experiences with adherence. Factors influencing DAPT knowledge included access to medication counselling, engaging with information communicated during medication counselling, and access to timely, relevant and expert information and advice after discharge from hospital.

CONCLUSIONS

Positive attitudes towards adherence were facilitated by knowledge and understanding of DAPT and confidence in dealing with symptoms caused by DAPT, but hindered by lack of opportunities to access relevant, timely and appropriate medication counselling. Education interventions should aim to support medication literacy through family-centred approaches and involve patients and families at all stages of intervention design and evaluation.

Conceptualization, Development and Psychometric Evaluations of a New Medication-Related Health Literacy Instrument: The Chinese Medication Literacy Measurement

There is a need for valid and reliable instruments to focus on medication aspects of health literacy and help healthcare professionals address patients’ barriers to medication use. This cross-sectional study describes the conceptualization, development, and psychometric properties of the first Chinese Medication Literacy Measurement (ChMLM) to assess the level of health literacy on medication use. The 17-item ChMLM (ChMLM-17) and its short form, 13-item ChMLM (ChMLM-13), consist of four sections (vocabulary, over-the-counter labels, prescription labels, and advertisements) to cover six domains of medication-related health literacy. Multistage stratified quota sampling was attempted to recruit a representative sample in Taiwan. Receiver operating characteristic curves were used to identify the cut-off point for differentiating high and low medication literacy. Psychometric analyses were performed (n = 1410) to assess the reliability and validity separately on all samples and sociodemographic subgroups. The 17- and 13-item versions both had high construct validity among all patients and patients with low medication literacy. The developed ChMLM-17 and ChMLM-13 is expected to help healthcare providers and researchers to accurately measure medication-related health literacy and improve medication use in the real-world practice.

Impact of Health Literacy on Medication Engagement Among Adults With Diabetes in the United States: A Systematic Review

PURPOSE

The purpose of this systematic review is to assess evidence of a relationship between health literacy and medication engagement (formerly referred to as medication adherence) among adults with diabetes mellitus in the United States.

METHODS

Literature searches were conducted in PubMed, Ovid Medline, CINAHL, Embase, PsycInfo, and Scopus from the inception of each database to April 2020. Studies were included if they met all of the following criteria: (1) conducted in the United States, (2) the population of interest was adults ≥18 years with a diagnosis of type 1 or type 2 diabetes, (3) medication engagement was an outcome variable, (4) a direct and not a mediating relationship between health literacy and medication engagement was assessed, (5) a quantifiable measure of association was reported, and (6) a full-text journal article or dissertation was available. Quality of published evidence was graded according to Joanna Briggs Institute Critical Appraisal Checklists appropriate for the respective study designs identified.

RESULTS

Thirteen articles from 11 unique studies were retained in the review, most of which used a cross-sectional design. Four out of 11 studies found a direct positive association between health literacy and medication engagement. Two of the 4 studies with positive findings had significant methodological shortcomings.

CONCLUSIONS

There is some evidence that health literacy is associated with medication engagement among adults with diabetes in the United States. Properly designed and executed longitudinal studies are needed to better elucidate the relationship between health literacy and medication engagement among adults with diabetes.

Establishing the efficacy of interventions to improve health literacy and health behaviours: a systematic review

Background

The primary aim of this review was to establish whether health literacy interventions, in adults, are effective for improving health literacy. Two secondary aims assessed the impact of health literacy interventions on health behaviours and whether health literacy interventions have been conducted in cardiovascular patients.

Methods

A systematic review (Prospero registration: CRD42018110772) with no start date running through until April 2020. Eligible studies were conducted in adults and included a pre/post measure of health literacy. Medline, Embase, Eric, PsychINFO, CINAHL, Psychology and Behavioural Science, HMIC, Web of Science, Scopus, Social Care Online, NHS Scotland Journals, Social Policy and Practice, and Global Health were searched. Two thousand one hundred twenty-seven papers were assessed, and 57 full text papers screened to give 22 unique datasets from 23 papers. Risk of bias was assessed regarding randomisation, allocation sequence concealment, blinding, incomplete outcome data, selective outcome reporting and other biases. Intervention reporting quality was assessed using the TIDieR checklist.

Results

Twenty-two studies were included reporting on 10,997 participants in nine countries. The majority of studies (14/22) were published in 2018 or later. Eight studies (n = 1268 participants) also reported on behavioural outcomes. Health literacy interventions resulted in improvements in at least some aspect of health literacy in 15/22 studies (n = 10,180 participants) and improved behavioural outcomes in 7/8 studies (n = 1209 participants). Only two studies were conducted with cardiovascular patients. All studies were at risk of bias with 18 judged as high risk. In addition, there was poor reporting of intervention content with little explication of the theoretical basis for the interventions.

Conclusions

Health literacy interventions can improve health literacy and can also lead to changes in health behaviours. Health literacy interventions offer a way to improve outcomes for populations most at risk of health inequalities. Health literacy is a developing field with very few interventions using clear theoretical frameworks. Closer links between health literacy and behaviour change theories and frameworks could result in higher quality and more effective interventions.

Prospero registration

Prospero registration: CRD42018110772

Improving Adherence in Type 2 Diabetes

International Diabetes Federation estimates that there are more than a half-billion adults ages 20 to 79 years worldwide who have diabetes mellitus (DM) and that the global health care expenditure for adults with DM in 2015 was $673 billion. Nonadherence and nonpersistence to prescribed type 2 DM medications are common and remain a barrier to optimal health outcomes. There is a high prevalence of nonadherence among older adults. Research has focused on prevalence and predictors of adherence, research methodologies, and development of measures of adherence. Improvements hopefully will result in better disease monitoring, medication adherence, and reduced rates of diabetes complications.

Patient factors associated with diabetes medication adherence at different health literacy levels: a cross-sectional study at a family medicine clinic

BACKGROUND

Type 2 diabetes (T2D) incurs tremendous health costs associated with various complications due to poor diabetes control. Medication adherence, which is correlated with patients' health literacy, should be consistently practiced achieving optimal diabetes control. A deeper understanding of the specific communication and psychosocial factors related to medication-taking behaviors across different levels of health literacy among people with T2D will guide the development of effective interventions and strategies to enhance medication adherence.

OBJECTIVES

This cross-sectional study aimed to identify salient patient factors associated with diabetes medication adherence across different levels of health literacy.

METHODS

A questionnaire was administered via a face-to-face approach with 205 participants at a family medicine clinic. Study participants were all above 20 years of age with T2D, were prescribed at least one oral diabetes medication, and understood English. The questionnaire assessed participants' health literacy, self-efficacy for medication use, beliefs in medicines, patient-provider communication, perceived barriers to medication adherence, and self-reported medication adherence. Separate analysis of covariance was used to compare the mean scores of patient factors related to medication adherence across people with different health literacy levels.

RESULTS

The mean age of participants was 61 years old, and the majority of the participants were female (57%), White (75%), and college educated (62%). Thirty-three percent of the participants had adequate health literacy, but only 43% of them reported high adherence to their diabetes medications. Analysis of covariance showed that having stronger self-efficacy (P < 0.001), lower concern beliefs about medication (P = 0.047), and fewer perceived barriers to medication-taking (P < 0.001), are necessary for better medication adherence.

CONCLUSION

Findings suggest that practitioners should address concern beliefs among low-adherent patients with low health literacy, help improve self-efficacy, and address perceived barriers to medication adherence among all low-adherent patients to optimally support patients' diabetes care.

Associations Between Health Literacy and Medication Self-Management Among Community Health Center Patients with Uncontrolled Hypertension

PURPOSE

Examine associations between health literacy and several medication self-management constructs among a population of adults with uncontrolled hypertension.

PATIENTS AND METHODS

Cross-sectional study of health center patients from the Chicago area with uncontrolled hypertension enrolled between April 2012 and February 2015. Medication self-management constructs-applied to hypertension medications, chronic condition medications and all medications-included: 1) medication reconciliation, 2) knowledge of drug indications, 3) understanding instructions and dosing, and 4) self-reported adherence over 4 days (no missed doses). We determined associations between health literacy and self-management outcomes using multivariable generalized linear regression.

RESULTS

There were 1460 patients who completed screening interviews; 62.9% enrolled and had complete baseline data collected, and were included in the analysis. Of 919 participants, 47.4% had likely limited (low), 33.2% possibly limited, and 19.4% likely adequate health literacy. Compared to participants with likely adequate health literacy, participants with low health literacy were less likely to have chronic medications reconciled (18.0% versus 29.6%, p=0.007), know indications for chronic medications (64.1% versus 83.1%, p<0.001), and demonstrate understanding of instructions and dosing (68.1% versus 82.9%, p=0.001). Self-reported adherence to hypertension medications was higher among the low health literacy group (65.6% versus 56.0%, p=0.010). In multivariable models, health literacy was strongly associated with knowledge of drug indications, and understanding of instructions and dosing.

CONCLUSION

Low health literacy was associated with worse medication self-management in several domains. However, non-adherence was greatest in the most health literate in unadjusted analysis. Among a population of patients with uncontrolled hypertension, the drivers of poor control may vary by health literacy.

Effective interventions to improve the health literacy of cancer patients

Health literacy (HL) refers to the cognitive and social abilities that are determinants in the motivation and capacity of the individual to access, understand and use information for the care of one’s own health. In oncology, increased survival, navigation of the healthcare system, the many different forms of treatment and the management of adverse effects/outcomes make HL a critical factor in patient care. The objective of this study is to identify the structure, content and effectiveness of interventions to improve HL in cancer patients.

Low Health Literacy Is Associated With Risk of Developing Type 2 Diabetes in a Nonclinical Population

PURPOSE

The purpose of this study was to examine associations among risk of type 2 diabetes (T2D), health literacy levels, and sociodemographic characteristics in a nonclinical adult population to assist in the development of effective T2D prevention programs.

METHODS

The Health Literacy Questionnaire and Australian Type 2 Diabetes Risk Assessment Tool were included in an online survey. Participants were a random sample of adults residing in each Australian state and territory. Data were analyzed with descriptive statistics and multinomial logistic regression.

RESULTS

A total of 1279 Australian adults participated (52% female; mean ± SD age, 61 ± 12 years). Most were at medium (42.4%) or high (46.9%) risk of developing T2D. The lowest health literacy scores were found for the domains "critical appraisal of health information" and "navigating the health care system." After controlling for covariates, participants at the highest risk of developing T2D were significantly more likely to be unemployed, have ≥1 chronic conditions, or have a mental health condition. Furthermore, they were significantly more likely to develop T2D if they scored low in 1 of the following health literacy domains: critical appraisal of health information, navigating the health care system, actively managing health, social support, and health care provider support.

CONCLUSIONS

Health literacy was associated with increased risk for developing T2D and should therefore be part of diabetes prevention initiatives. Specifically, new health promotion initiatives need to help people develop skills required to critically appraise health information and navigate the health care system. Health practitioners and educators should ensure that health information developed for consumers is uncomplicated and easily understood.

Design and rationale of a mixed methods randomized control trial: ADdressing Health literacy, bEliefs, adheRence and self-Efficacy (ADHERE) program to improve diabetes outcomes

BACKGROUND

Improving medication adherence is one of the most effective approaches to improving the health outcomes of patients with diabetes. To date, enhancing diabetes medication adherence has occurred by improving diabetes-related knowledge. Unfortunately, behavior change often does not follow knowledge change. Enhancing communication between patients and healthcare professionals through addressing health literacy-related psychosocial attributes is critical.

OBJECTIVE

Examine whether a patient-centered intervention augmenting usual care with a health literacy-psychosocial support intervention will improve medication adherence for patients with diabetes, compared to usual care.

METHODS

This study is a randomized controlled trial with an intervention mixed methods design. Fifty participants being enrolled are English-speaking, 18-80 years old with diagnosed diabetes, take at least one diabetes medication, have low diabetes medication adherence (proportion of days covered less than 80% or based on clinical notes), and have poor diabetes control (hemoglobin A1c of ≥8%). Participants will be allocated to either a control group receiving usual care (n = 25) or an intervention group (n = 25) receiving usual care and a 6-session intervention focusing on the modifiable psychosocial factors that may influence medication adherence. A questionnaire will be administered at baseline and at the end of the intervention to all participants to assess the effectiveness of the intervention. Fifteen participants from the intervention group will be interviewed to explore participants' experiences and perceptions of the intervention processes and outcomes.

CONCLUSIONS

The trial will examine if a patient-centered intervention that addresses patients' health literacy and focuses on modifiable psychosocial factors will improve medication adherence among patients with diabetes.

Adherence to cardiovascular medication: a review of systematic reviews

BACKGROUND

Use of cardiovascular medication has increased over time, especially for primary and secondary prevention, with polypharmacy common.

METHODS

Review of published systematic reviews of the factors and outcomes associated with adherence to cardiovascular medication using MEDLINE, Embase, CINAHL and PsycINFO databases. Quality was assessed using the AMSTAR tool.

RESULTS

Of 789 systematic reviews identified, 45 met the inclusion criteria and passed the quality assessment; 34 focused on factors associated with adherence, and 11 on outcomes. High heterogeneity, both between and within reviews, precluded meta-analysis and so a pooled estimate of adherence levels could not be derived. Adherence was associated with disease factors, therapy factors, healthcare factors, patient factors and social factors, though with some inconsistencies. In total, 91% of reviews addressing outcomes reported that low adherence was associated with poorer clinical and economic endpoints.

CONCLUSIONS

Factors from across five key domains relate to non-adherence to cardiovascular medications, and may contribute to poorer clinical outcomes. Interventions to improve adherence should be developed to address modifiable factors and targeted at those at highest risk of non-adherence. Adherence research is highly heterogeneous to-date and efforts to standardize this should be implemented to improve comparability.

A path model linking health literacy, medication self-efficacy, medication adherence, and glycemic control

OBJECTIVE

To investigate whether medication self-efficacy moderates or mediates the relationship between health literacy and medication adherence. To propose a path model that illustrates the interrelated relationship between health literacy, medication self-efficacy, medication adherence, and hemoglobin A1c (HbA1c).

METHODS

This cross-sectional study was performed via a face-to-face survey. Factors that may influence medication adherence and HbA1c were identified from the literature review. One hundred and seventy-four participants included were ≥20 years old with diagnosed type 2 diabetes, understood English, and were prescribed at least one oral diabetes medicine. During clinic visits, a questionnaire was administered to evaluate health literacy, medication self-efficacy, and medication adherence. HbA1c values were obtained from electronic medical records. Path analyses were conducted for data analysis.

RESULTS

Medication self-efficacy mediated but did not moderate the relationship between numeracy and diabetes medication adherence. Participants with higher numeracy skills may develop a greater level of medication self-efficacy, which in turn may result in a higher level of diabetes medication adherence and a lower level of HbA1c.

CONCLUSION

Enhancing patients' medication self-efficacy and numeracy skills may be imperative in intervention programs to improve diabetes medication adherence.

PRACTICE IMPLICATIONS

An improvement in numeracy skills and medication self-efficacy is recommended to enhance diabetes medication adherence.

Comparative adherence to weekly oral and quarterly intravenous bisphosphonates among patients with limited heath literacy who sustained distal radius fractures

Individuals with limited health literacy (HL) are less likely to obtain preventive care. We designed a study to compare adherence to weekly oral and quarterly intravenous bisphosphonates among patients with low HL. The study enrolled a total of 432 female patients who presented with a distal radius fracture caused by low-energy trauma. Participant HL was measured using the Newest Vital Sign tool, and patients were randomized to weekly oral or quarterly intravenous bisphosphonate groups. Subjects in the intravenous bisphosphonate group received intravenous injections of 3 mg ibandronate every 3 months, and those in the oral bisphosphonate group self-administered 70 mg alendronate orally once each week for 12 months. The adherence to weekly oral or quarterly intravenous bisphosphonates was analyzed by HL level. The rate of adherence to quarterly intravenous bisphosphonates was significantly higher than that for weekly oral bisphosphonates in patients with inadequate HL (73 vs. 46%, p = 0.001), whereas no significant differences were observed between HL groups in adherence to intravenous bisphosphonate. Conversely, the rate of adherence to orally administered bisphosphonates was significantly lower in patients with inadequate HL than in those with appropriate HL (46 vs. 65%, p = 0.005). After controlling for confounding variables, inadequate HL, the presence of comorbidities, and weekly oral bisphosphonates were associated with a higher likelihood of nonadherence to osteoporosis treatment. Thus patients with limited health literacy can achieve rates of adherence to quarterly intravenous bisphosphonates, as opposed to weekly oral bisphosphonates, similar to rates among patients with appropriate literacy.

Selective prescribing of statins and the risk of mortality, hospitalizations, and falls in aged care services

BACKGROUND

Compared to randomized controlled trials, nonexperimental studies often report larger survival benefits but higher rates of adverse events for statin use vs nonuse.

OBJECTIVE

We compared characteristics of statin users and nonusers living in aged care services and evaluated the relationships between statin use and all-cause mortality, all-cause and fall-related hospitalizations, and number of falls during a 12-month follow-up.

METHODS

A prospective cohort study of 383 residents aged ≥65 years was conducted in six Australian aged care services. Data were obtained from electronic medical records and medication charts and through a series of validated assessments.

RESULTS

The greatest differences between statin users and nonusers were observed in activities of daily living, frailty, and medication use (absolute standardized difference >0.40), with users being less dependent and less frail but using a higher number of medications. Statin use was associated with a decreased risk of all-cause mortality (adjusted hazard ratio [HR] 0.58, 95% confidence interval [CI] 0.37-0.93) and hospitalizations (HR 0.67, 95% CI 0.46-0.98). After exclusion of residents unable to sit or stand, statin use was associated with a nonsignificant increase in the risk of fall-related hospitalizations (HR 1.47, 95% CI 0.80-2.68) but with a lower incidence of falls (incidence rate ratio 0.67, 95% CI 0.47-0.96).

CONCLUSIONS

The observed associations between statin use and the outcomes may be largely explained by selective prescribing and deprescribing of statins and variation in likelihood of hospitalization based on consideration of each resident's clinical and frailty status. Randomized deprescribing trials are needed to guide statin prescribing in this setting.

A Cardiovascular Health Intervention for Spanish Speakers: The Health Literacy and ESL Curriculum

Spanish speakers in the United States are in need of effective interventions that address both cardiovascular disease (CVD) and health literacy. However, the literature lacks interventions that have used and evaluated a strategies that focus on both, particularly at the community level. The aim of this study was to explore the effect of a health literacy curriculum on cardiovascular health behavior among Spanish speaking adults. It used a randomized controlled pre-posttest design. Participants included Hispanic adults with a low-to-intermediate level of English proficiency. The intervention group received the health literacy and English as a second language (ESL) Curriculum with CVD specific content, while the control group received a conventional ESL curriculum. Tools included the Spanish Cardiovascular Health Questionnaire (CSC), the test of functional health literacy in adults (TOFHLA), and the Combined English Language Skills Assessment. Analysis of change scores included independent sample t test and multiple linear regression. A total of 155 participants completed the study. There was a significant greater improvement for the intervention group in change of CSC score from pretest to posttest (P = 0.049) compared to controls. The study also found significantly improved TOFHLA (P = 0.011), however it did not find a relationship between changes in CVD behavior and health literacy or English proficiency. The Health Literacy and ESL Curriculum constitutes a valuable resource for addressing the cardiovascular health, literacy, and language needs of Spanish-speaking adults. Interventions that take a multilevel education and health approach may be more effective in addressing the needs of immigrants. Research should further explore the interactions between CVD behavior, health literacy, and English proficiency.

Factors associated with health literacy in multimorbid patients in primary care: a cross-sectional study in Switzerland

OBJECTIVE

To identify factors associated with health literacy in multimorbid patients.

DESIGN

A nationwide cross-sectional study in Switzerland. Univariate and multivariate linear regressions were calculated to identify variables associated with health literacy. A multiple imputation approach was used to deal with missing values.

PARTICIPANTS

Multimorbid patients recruited in primary care settings (n=888), above 18 years old and suffering from at least 3 of 75 chronic conditions on a predefined list based on the International Classification of Primary Care 2.

MAIN MEASURES

Health literacy was assessed using the European Health Literacy Survey project questionnaire (HLS-EU 6). This comprises six items scored from 1 to 4 (very difficult=1, fairly difficult=2, fairly easy=3, very easy=4), and the total health literacy score is computed as their mean. As we wished to understand the determinants associated with lower health literacy, the HLS-EU 6 score was the only dependent variable; all other covariates were considered independent.

RESULTS

The mean health literacy score (SD) was 2.9 (0.5). Multivariate analyses found significant associations between low health literacy scores and treatment burden scores (β=-0.004, 95% CI -0.006 to 0.002); marital status, predominantly the divorced group (β=0.136, 95% CI 0.012 to 0.260); dimensions of the EuroQuol 5 Dimension 3 Level (EQ5D3L) quality of life assessment, that is, for moderate problems with mobility (β=-0.086, 95% CI -0.157 to 0.016); and with moderate problems (β=-0.129, 95% CI -0.198 to 0.060) and severe problems with anxiety/depression (β=-0.343, 95% CI -0.500 to 0.186).

CONCLUSIONS

Multimorbid patients with a high treatment burden, altered quality of life by problems with mobility, anxiety or depression, often also have low levels of health literacy. Primary care practitioners should therefore pay particular attention to these patients in their daily practice.

Effect of a health literacy intervention trial on knowledge about cardiovascular disease medications among Indigenous peoples in Australia, Canada and New Zealand

OBJECTIVES

To assess the effect of a customised, structured cardiovascular disease (CVD) medication health literacy programme on medication knowledge among Indigenous people with, or at high risk of, CVD.

DESIGN

Intervention trial with premeasures and postmeasures at multiple time points.

SETTING

Indigenous primary care services in Australia, Canada and New Zealand.

PARTICIPANTS

171 Indigenous people aged ≥20 years of age who had at least one clinical diagnosis of a CVD event, or in Canada and Australia had a 5-year CVD risk ≥15%, and were prescribed at least two of the following CVD medication classes: statin, aspirin, ACE inhibitors and beta blockers.

INTERVENTION

An education session delivered on three occasions over 1 month by registered nurses or health educators who had received training in health literacy and principles of adult education. An interactive tablet application was used during each session and an information booklet and pill card provided to participants.

PRIMARY OUTCOME MEASURES

Knowledge about the CVD medications assessed before and after each session.

RESULTS

Knowledge at baseline (presession 1) was low, with the mean per cent correct answers highest for statins (34.0% correct answers), 29.4% for aspirin, 26.0% for beta blockers and 22.7% for ACE inhibitors. Adjusted analyses showed highly significant (P<0.001) increases in knowledge scores between preassessments and postassessments at all three time points for all medication classes. For the four medications, the absolute increases in adjusted per cent correct items from presession 1 to postsession 3 assessments were 60.1% for statins, 76.8% for aspirin, 71.4% for ACE inhibitor and 69.5% for beta blocker.

CONCLUSIONS

The intervention was highly effective in contextually diverse Indigenous primary healthcare services in Australia, Canada and New Zealand. The findings from this study have important implications for health services working with populations with low health literacy more generally.

TRIAL REGISTRATION NUMBER

ACTRN12612001309875.

Health literacy in type 2 diabetes patients: a systematic review of systematic reviews

Aim To summarize, critically review, and interpret the evidence related to the systematic reviews on health literacy (HL) amongst type 2 diabetes mellitus (T2DM). Methods The methodology for this study consisted of a systematic review of systematic reviews, using the PRISMA statement and flowchart to select studies, and searching on PubMed, CINAHL, Scopus, and Cochrane. The search covered the period between January 2006 and June 2016. Results From the 115 identified record by the queries, only six systematic reviews were included, following a quality evaluation using AMSTAR. The included systematic reviews content was analyzed by the independent work of two authors, using a narrative synthesis approach. The findings of this study (i.e., main themes) are areas of consensus and gaps in knowledge. Areas of consensus are HL definition, HL measurement tools, and the relationship between T2DM patient knowledge (or literacy) and his/her HL. The gaps in knowledge were the assessment of the relations between HL and health outcomes and self-efficacy, the gender differences, the effectiveness of interventions to improve HL, the cost-effectiveness study of interventions to improve HL, and the understanding of the influence of organizational environment on HL. Conclusion This review provides a current state of knowledge to address clinical practice and research proposals. HL could be useful to personalize patients' follow-up and it should be routinely assessed in its three dimensions (i.e. functional, interactive and critical) to enhance patients' ability to cope with clinical recommendations. Future research should be mainly aimed to test the effectiveness of evidence-based interventions to improve HL amongst T2DM patients.

Association of health literacy and medication self-efficacy with medication adherence and diabetes control

INTRODUCTION

The exact pathway linking health literacy, self-efficacy, medication adherence, and glycemic control for type 2 diabetes remains unclear. Understanding the relationship between patient factors, medication adherence, and lower glycated hemoglobin (HbA1c) may help patients better manage their disease. This study examined the association of health literacy and medication self-efficacy with self-reported diabetes medication adherence, and the association of health literacy, medication self-efficacy, and self-reported diabetes medication adherence with HbA1c of patients with type 2 diabetes.

METHODS

This cross-sectional study utilized a face-to-face questionnaire at two family medicine clinics in a Midwestern state among 174 patients; subjects enrolled were at least 20 years old with diagnosed type 2 diabetes, prescribed at least one oral diabetes medicine, and understood English. Questionnaires were administered to assess the participants': health literacy, using the Newest Vital Sign six-item questionnaire (NVS); self-efficacy for medication use, using the 13-item Self-Efficacy for Appropriate Medication Use Scale; and self-report medication adherence, using the eight-item Morisky Medication Adherence Scale. HbA1c values were obtained from participants' electronic medical records. Multiple linear regressions were used to explore the association of health literacy and medication self-efficacy with both medication adherence and HbA1c level after controlling for all other covariates.

RESULTS

Self-reported health status (β = 0.17, p = 0.015) and medication self-efficacy (β = 0.53, p < 0.001) were positively associated with diabetes medication adherence. Health literacy was neither associated with diabetes medication adherence (β = -0.04, p = 0.586) nor HbA1c (β = -0.06, p = 0.542). Lower diabetes medication adherence (β = -0.26, p = 0.008) and higher number of prescribed medications (β = 0.28, p = 0.009) were correlated with higher HbA1c.

CONCLUSION

Health literacy, as measured by the NVS, does not correlate with medication adherence or glycemic control among patients with type 2 diabetes. Interventions to improve patients' self-efficacy of medication use may improve diabetes medication adherence.

Effect of health literacy on adherence to osteoporosis treatment among patients with distal radius fracture

Patients with inadequate health literacy, those with medical comorbidities, or those with a previous history of adverse drug events have a higher likelihood of non-adherence to osteoporosis treatment after sustaining a distal radius fracture.

INTRODUCTION

Patients with a distal radial fracture (DRF) have a higher risk of subsequent fractures, which provides an important opportunity to begin treatment for osteoporosis. This study assessed the effect that health literacy of patients suffering from a DRF has on the subsequent adherence to osteoporosis treatment.

METHODS

A total of 116 patients (female, over 50 years of age) presenting a DRF caused by low-energy trauma were enrolled. Their health literacy was measured using the Newest Vital Sign (NVS). Alendronate (70 mg, orally, once weekly) was prescribed to all patients for 1 year, and adherence was defined as taking at least 80% of the tablets for 12 months and returning for the visit on month 12. Multivariable analyses were conducted to determine whether the patients' clinical, demographic, and health literacy factors influenced their adherence to osteoporosis treatment.

RESULTS

About half (52%) of the participants who sustained a DRF exhibited an inadequate health literacy, and the rate of non-adherence to osteoporosis treatment was 38%. The rate of non-adherence for patients with inadequate literacy was significantly higher than for those with appropriate literacy (47 vs. 29%, p = 0.04). The results of the regression analysis indicate that limited health literacy, the presence of comorbidities, and prior history of adverse drug events are associated with a higher likelihood of non-adherence to osteoporosis treatment after sustaining a DRF.

CONCLUSIONS

Patients with inadequate health literacy, adverse drug events, or medical comorbidities had higher rates of non-adherence with alendronate treatment after sustaining a DRF. Further research is needed to show whether improvements in patient comprehension via informational intervention in patients with a DRF will improve adherence to osteoporosis treatment.

Synthesizing and Appraising the Quality of the Evidence on Factors Associated with Medication Adherence in Diabetes: A Systematic Review of Systematic Reviews

BACKGROUND

Nonadherence to medications is a common phenomenon in patients with diabetes. Several studies and systematic reviews have investigated the barriers to medication adherence in diabetes. However, no study has evaluated the quality of the existing literature and synthesized the plethora of evidence with a goal to design holistic conceptual frameworks and interventions.

OBJECTIVES

The aims of this review were to systematically evaluate existing systematic reviews focusing on factors associated with medication adherence in diabetes in an effort to synthesize the evidence, determine their methodological quality, and identify the gaps in the current literature.

METHODS

Fourteen databases and gray literature sources were systematically searched through June 2016. Systematic reviews reporting factors associated with medication adherence (barriers and facilitators) in patients with diabetes were selected on the basis of predetermined criteria. Studies were appraised for quality using AMSTAR (A Measurement Tool to Assess Systematic Reviews).

RESULTS

Seventeen systematic reviews including 542 primary studies, most of which were cross-sectional quantitative studies, were included. All the reviews were rated as moderate to low quality and exhibited common methodological pitfalls. Factors influencing medication adherence identified were categorized as patient-, medication-, disease-, health care provider-, health care system-, and social-related factors.

CONCLUSIONS

Factors influencing medication adherence are multifactorial with remarkably consistent findings across the existing reviews; yet, most reviews were judged to be of low to moderate quality. Further comprehensive and well-conducted original studies and systematic reviews on this topic shall be conducted taking into consideration the drawbacks of existing ones.

Predictors of Medication Adherence in the Elderly: The Role of Mental Health

The aging population routinely has comorbid conditions requiring complicated medication regimens, yet nonadherence can preclude optimal outcomes. This study explored the association of adherence in the elderly with demographic, socioeconomic, and disease burden measures. Data were from the fifth visit (2011-2013) for 6,538 participants in the Atherosclerosis Risk in Communities Study, conducted in four communities. The Morisky-Green-Levine Scale measured self-reported adherence. Forty percent of respondents indicated some nonadherence, primarily due to poor memory. Logit regression showed, surprisingly, that persons with low reading ability were more likely to report being adherent. Better self-reported physical or mental health both predicted better adherence, but the magnitude of the association was greater for mental than for physical health. Compared with persons with normal or severely impaired cognition, mild cognitive impairment was associated with lower adherence. Attention to mental health measures in clinical settings could provide opportunities for improving medication adherence.

Cardiovascular disease risk and secondary prevention of cardiovascular disease among patients with low health literacy

OBJECTIVE

To explore the association between health literacy and the risk of cardiovascular disease (CVD), and to assess the differential effects by health literacy level of a nurse-coordinated secondary prevention program (NCPP) in patients with coronary artery disease (CAD).

METHODS

Data were collected in two medical centres participating in the RESPONSE trial (Randomised Evaluation of Secondary Prevention by Outpatient Nurse SpEcialists). CVD risk profiles were assessed at baseline and 12-month follow-up using the Systematic Coronary Risk Evaluation (SCORE). Health literacy was assessed by the short Rapid Estimate of Adult Literacy in Medicine (REALM-D) and the Newest Vital Sign (NVS-D); self-reported health literacy was evaluated by the Set of Brief Screening Questions (SBSQ-D).

RESULTS

Among 201 CAD patients, 18% exhibited reading difficulties, 52% had difficulty understanding and applying written information, and 5% scored low on self-reported health literacy. Patients with low NVS-D scores had a higher CVD risk [mean SCORE 5.2 (SD 4.8) versus 3.3 (SD 4.1), p < 0.01]. Nurse-coordinated care seemed to reduce CVD risk irrespective of health literacy levels without significant differences.

CONCLUSION

Inadequate health literacy is prevalent in CAD patients in the Netherlands, and is associated with less favourable CVD risk profiles. Where many other forms of CVD prevention fail, nurse-coordinated care seems to be effective among patients with inadequate health literacy.

The impact of inadequate health literacy on patient satisfaction, healthcare utilization, and expenditures among older adults

Inadequate health literacy (HL) is associated with impaired healthcare choices leading to poor quality-of-care. Our primary purpose was to estimate the prevalence of inadequate HL among two populations of AARP^® Medicare Supplement insureds: sicker and healthier populations; to identify characteristics of inadequate HL; and to describe the impact on patient satisfaction, preventive services, healthcare utilization, and expenditures. Surveys were mailed to insureds in 10 states. Multivariate regression models were used to identify characteristics and adjust outcomes. Among respondents (N = 7334), 23% and 16% of sicker and healthier insureds, respectively, indicated inadequate HL. Characteristics of inadequate HL included male gender, older age, more comorbidities, and lower education. Inadequate HL was associated with lower patient satisfaction, lower preventive service compliance, higher healthcare utilization and expenditures. Inadequate HL is more common among older adults in poorer health, further compromising their health outcomes; thus they may benefit from expanded educational or additional care coordination interventions.

Methodological review: quality of randomized controlled trials in health literacy

BACKGROUND

The growing move towards patient-centred care has led to substantial research into improving the health literacy skills of patients and members of the public. Hence, there is a pressing need to assess the methodology used in contemporary randomized controlled trials (RCTs) of interventions directed at health literacy, in particular the quality (risk of bias), and the types of outcomes reported.

METHODS

We conducted a systematic database search for RCTs involving interventions directed at health literacy in adults, published from 2009 to 2014. The Cochrane Risk of Bias tool was used to assess quality of RCT implementation. We also checked the sample size calculation for primary outcomes. Reported evidence of efficacy (statistical significance) was extracted for intervention outcomes in any of three domains of effect: knowledge, behaviour, health status. Demographics of intervention participants were also extracted, including socioeconomic status.

RESULTS

We found areas of methodological strength (good randomization and allocation concealment), but areas of weakness regarding blinding of participants, people delivering the intervention and outcomes assessors. Substantial attrition (losses by monitoring time point) was seen in a third of RCTs, potentially leading to insufficient power to obtain precise estimates of intervention effect on primary outcomes. Most RCTs showed that the health literacy interventions had some beneficial effect on knowledge outcomes, but this was typically for less than 3 months after intervention end. There were far fewer reports of significant improvements in substantive patient-oriented outcomes, such as beneficial effects on behavioural change or health (clinical) status. Most RCTs featured participants from vulnerable populations.

CONCLUSIONS

Our evaluation shows that health literacy trial design, conduct and reporting could be considerably improved, particularly by reducing attrition and obtaining longer follow-up. More meaningful RCTs would also result if health literacy trials were designed with public and patient involvement to focus on clinically important patient-oriented outcomes, rather than just knowledge, behaviour or skills in isolation.

Difference in Effectiveness of Medication Adherence Intervention by Health Literacy Level

CONTEXT

There is little research investigating whether health information technologies, such as interactive voice recognition, are effective ways to deliver information to individuals with lower health literacy.

OBJECTIVE

Determine the extent to which the impact of an interactive voice recognition-based intervention to improve medication adherence appeared to vary by participants' health literacy level.

DESIGN

Promoting Adherence to Improve Effectiveness of Cardiovascular Disease Therapies (PATIENT) was a randomized clinical trial designed to test the impact, compared with usual care, of 2 technology-based interventions that leveraged interactive voice recognition to promote medication adherence. A 14% subset of participants was sent a survey that included questions on health literacy. This exploratory analysis was limited to the 833 individuals who responded to the survey and provided data on health literacy.

MAIN OUTCOME MEASURES

Adherence to statins and/or angiotensin-converting enzyme inhibitors and/or angiotensin II receptor blockers.

RESULTS

Although intervention effects did not differ significantly by level of health literacy, the data were suggestive of differential intervention effects by health literacy level.

CONCLUSIONS

The differences in intervention effects for high vs low health literacy in this exploratory analysis are consistent with the hypothesis that individuals with lower health literacy may derive greater benefit from this type of intervention compared with individuals with higher health literacy. Additional studies are needed to further explore this finding.

Relationship Between Health Literacy and Unintentional and Intentional Medication Nonadherence in Medically Underserved Patients With Type 2 Diabetes

PURPOSE

The purpose of this study was to investigate the relationship between health literacy and overall medication nonadherence, unintentional nonadherence, and intentional nonadherence. Limited health literacy may be associated with worse diabetes outcomes, but the literature shows mixed results, and mechanisms remain unclear. Medication adherence is associated with diabetes outcomes and may be a mediating factor. Distinguishing between unintentional and intentional nonadherence may elucidate the relationship between health literacy and nonadherence in patients with type 2 diabetes.

METHODS

Cross-sectional study of 208 patients with type 2 diabetes recruited from a primary care clinic in St. Louis, Missouri. Information was obtained from written questionnaire and patient medical records. Bivariate and multivariable regression were used to examine predictors of medication nonadherence.

RESULTS

The majority of patients in the study were low income, publicly insured, and African American, with limited health literacy and a high school/GED education or less. In multivariable models, limited health literacy was significantly associated with increased unintentional nonadherence but not intentional nonadherence.

CONCLUSIONS

Results suggest differences in factors affecting intentional and unintentional nonadherence. The findings also suggest interventions are needed to decrease unintentional nonadherence among patients with type 2 diabetes and limited health literacy. Efforts to address unintentional medication nonadherence among patients with type 2 diabetes with limited health literacy may improve patient health.

Health Literacy in Adolescents and Young Adults: An Updated Review

PURPOSE

Health literacy is important for health outcomes in adults. However, little is known about the health literacy of adolescents and young adults (AYAs). The purpose of this study was to provide an updated systematic review examining health literacy among AYAs with and without chronic illness. Specifically, the review considered (1) what sources of health information AYAs use; (2) how well AYAs are able to understand, communicate, and critically evaluate health-related information; and (3) whether health literacy is associated with health behaviors and outcomes.

METHODS

A systematic search was conducted for literature published in peer-reviewed journals using Medline, Embase, and PsycINFO databases.

RESULTS

Of 603 articles reviewed, 14 studies met the inclusion criteria, six of which examined health literacy in a chronic illness population. Studies reported high usage for information sources, though no clear links between source type and health literacy emerged. Adequate health literacy was reported in at least 60% of participants, though poor functional literacy was reported. Few studies explored communicative or critical health literacy; those that did indicated that AYAs experience challenges in these domains. Poorer health literacy was associated with some adverse health outcomes, such as obesity and smoking. For AYAs with a chronic illness, there were mixed findings between health literacy and medication adherence.

CONCLUSION

Understanding the challenges AYAs face with regards to complex developing communicative and critical health literacy skills is crucial. Due to the paucity of research in this field, addressing health literacy across all AYAs will provide a valuable step in guiding research in AYAs with cancer.

Factors affecting medication adherence in elderly people

BACKGROUND

Little is known about the functional health literacy (FHL) associated with medication adherence in elderly patients. The aim of this study was to examine the FHL among older adults and identify influencing factors that can predict medication adherence.

METHODS

This was a cross-sectional survey. Participants (n=160) aged 65 years and older were selected from outpatient clinics of 3 tertiary care hospitals, 6 community pharmacies, and 2 senior centers between November 1 and 30, 2014. The participants' FHL was measured using the Korean Functional Health Literacy Test, which consists of 15 items including 8 numeracy and 7 reading comprehension items. Medication adherence was measured by the Adherence to Refills and Medication Scale. Descriptive statistics, chi-square or Fisher's exact test, and multiple regression analyses were used to analyze the data.

RESULTS

The mean score of the total FHL was 7.72±3.51 (range 0-15). The percentage of the total number of correct answers for the reading comprehension subtest and numeracy subtest were 48.1% and 54.4%, respectively. Among 160 participants, 52.5% showed low adherence to medication. The factors affecting medication adherence included the patient's degree of satisfaction with the service (β=-0.215, P=0.022), sufficient explanation of medication counseling (β=-0.335, P=0.000), education level (β=-0.153, P=0.045), health-related problems (β=-0.239, P=0.004), and dosing frequency (β=0.189, P=0.018).

CONCLUSION

In this study, we found medication adherence of elderly patients was associated with education level, health-related problems, dosing frequency, satisfaction with patient counseling, and explanation of medication, but no association was found with FHL. Pharmacists should consider elderly patients' individual characteristics such as educational background and specific patient-related health problems, provide sufficient information and explanation of medication, and ensure patient satisfaction with the counseling.

The association of health literacy with adherence in older adults, and its role in interventions: a systematic meta-review

Background

Low health literacy is a common problem among older adults. It is often suggested to be associated with poor adherence. This suggested association implies a need for effective adherence interventions in low health literate people. However, previous reviews show mixed results on the association between low health literacy and poor adherence. A systematic meta-review of systematic reviews was conducted to study the association between health literacy and adherence in adults above the age of 50. Evidence for the effectiveness of adherence interventions among adults in this age group with low health literacy was also explored.

Methods

Eight electronic databases (MEDLINE, ERIC, EMBASE, PsycINFO, CINAHL, DARE, the Cochrane Library, and Web of Knowledge) were searched using a variety of keywords regarding health literacy and adherence. Additionally, references of identified articles were checked. Systematic reviews were included if they assessed the association between health literacy and adherence or evaluated the effectiveness of interventions to improve adherence in older adults with low health literacy. The AMSTAR tool was used to assess the quality of the included reviews. The selection procedure, data-extraction, and quality assessment were performed by two independent reviewers. Seventeen reviews were selected for inclusion.

Results

Reviews varied widely in quality. Both reviews of high and low quality found only weak or mixed associations between health literacy and adherence among older adults. Reviews report on seven studies that assess the effectiveness of adherence interventions among low health literate older adults. The results suggest that some adherence interventions are effective for this group. The interventions described in the reviews focused mainly on education and on lowering the health literacy demands of adherence instructions. No conclusions could be drawn about which type of intervention could be most beneficial for this population.

Conclusions

Evidence on the association between health literacy and adherence in older adults is relatively weak. Adherence interventions are potentially effective for the vulnerable population of older adults with low levels of health literacy, but the evidence on this topic is limited. Further research is needed on the association between health literacy and general health behavior, and on the effectiveness of interventions.

Electronic supplementary material

The online version of this article (doi:10.1186/s12889-015-2251-y) contains supplementary material, which is available to authorized users.

Discussing the Effects of Poor Health Literacy on Patients Facing HIV: A Narrative Literature Review

BACKGROUND

Scholars describe poor health literacy as a "silent epidemic," which is challenging the functioning of healthcare systems all over the world. Health literacy is mainly meant as an individual trait which concerns the ability to obtain, process, and understand basic health information in order to effectively navigate the health system. Low health literate patients perceive poor self-efficacy dealing with their health conditions, are not willing to be involved in the provision of care, show larger risks of hospitalization and mortality, and are not aware about the determinants of well-being. Hence, limited health literacy has been associated with inadequate management of long-term conditions; nonetheless, several authors argue that health literacy has been an overlooked factor dealing with HIV.

METHODS

This study is aimed at discussing the effects of poor health literacy on people living with HIV, drawing from the findings of a narrative literature review which involved 41 papers retrieved from the databases "Scopus-Elsevier" and "PubMed."

RESULTS

The scientific literature is not consistent dealing with the relationship between health literacy and HIV treatment. For example, health literate patients seem to better understand their health conditions; on the other hand, people living with poor health literacy are likely to report higher compliance with providers' prescriptions, blindly trusting healthcare professionals.

CONCLUSION

Poor health literacy is a social barrier to access healthcare services and to appropriate health treatment among patients living with HIV. Tailored interventions should be aimed at enhancing the health skills of patients affected by HIV infection to improve their ability to navigate the health system.

Impact of health literacy level on aspects of medication nonadherence reported by underserved patients with type 2 diabetes

BACKGROUND

Medication adherence can be affected by many factors, including health literacy. The purpose of this study is to determine (1) if a relationship exists between health literacy and self-reported or objectively measured medication adherence and (2) which aspect or aspects of medication nonadherence are most associated with health literacy.

SUBJECTS AND METHODS

This is a multicenter, cross-sectional survey study of adult patients with type 2 diabetes mellitus (T2DM), taking one or more antidiabetes medication for ≥6 months with a hemoglobin A1c (HbA1c) measure on record. Data collected included patient demographics (age, gender, race, language, highest level of education, injectable diabetes medication use, last HbA1c, and diabetes medication refill history) and two survey instruments (the Morisky eight-item Medication Adherence Scale [MMAS-8] and the short-form Test of Functional Health Literacy in Adults [s-TOFHLA]). Descriptive statistics and bivariate correlations were assessed, along with linear and logistic regression.

RESULTS

One hundred ninety-two patients with an average HbA1c level of 8.1% were included. Of these subjects, 32.8% had limited health literacy as measured by the s-TOFHLA, 58.9% had low adherence as measured by MMAS-8, and 65.1% were nonadherent based on cumulative medication gap (CMG) analysis. Age was associated with s-TOFHLA (-0.411; P<0.01) and MMAS-8 (0.157; P<0.05) scores. HbA1c was associated with MMAS-8 (-0.209; P<0.01) and CMG (0.152; P<0.05) scores. There was no significant association between s-TOFHLA and MMAS-8 or CMG. However, s-TOFHLA was positively related to MMAS-8 question 8, assessing difficulty remembering to take medications (P=0.017).

CONCLUSIONS

Health literacy level is not associated with self-reported or objectively measured medication adherence in underserved patients with T2DM. Lower health literacy scores are associated with a patient experiencing difficulty remembering to take medications.

Medication Nonadherence Before Hospitalization for Acute Cardiac Events

Medication nonadherence increases the risk of hospitalization and poor outcomes, particularly among patients with cardiovascular disease. The purpose of this study was to examine characteristics associated with medication nonadherence among adults hospitalized for cardiovascular disease. Patients in the Vanderbilt Inpatient Cohort Study who were admitted for acute coronary syndrome or heart failure completed validated assessments of self-reported medication adherence (the Adherence to Refills and Medications Scale), demographic characteristics, health literacy, numeracy, social support, depressive symptoms, and health competence. We modeled the independent predictors of nonadherence before hospitalization, standardizing estimated effects by each predictor's interquartile range. Among 1,967 patients studied, 70.7% indicated at least some degree of medication nonadherence leading up to their hospitalization. Adherence was significantly lower among patients with lower health literacy (0.18-point change in adherence score per interquartile range change in health literacy), lower numeracy (0.28), lower health competence (0.30), and more depressive symptoms (0.52) and those of younger age, of non-White race, of male gender, or with less social support. Medication nonadherence in the period before hospitalization is more prevalent among patients with lower health literacy, numeracy, or other intervenable psychosocial factors. Addressing these factors in a coordinated care model may reduce hospitalization rates.

Does high intelligence improve prognosis? The association of intelligence with recurrence and mortality among Swedish men with coronary heart disease

BACKGROUND

Lower intelligence early in life is associated with increased risks for coronary heart disease (CHD) and mortality. Intelligence level might affect compliance to treatment but its prognostic importance in patients with CHD is unknown.

METHODS

A cohort of 1923 Swedish men with a measure of intelligence from mandatory military conscription in 1969-1970 at age 18-20, who were diagnosed with CHD 1991-2007, were followed to the end of 2008.

PRIMARY OUTCOME

recurrent CHD event. Secondary outcome: case fatality from the first event, cardiovascular and all-cause mortality. National registers provided information on CHD events, comorbidity, mortality and socioeconomic factors.

RESULTS

The fully adjusted HRs for recurrent CHD for medium and low intelligence, compared with high intelligence, were 0.98, (95% CIs 0.83 to 1.16) and 1.09 (0.89 to 1.34), respectively. The risks were increased for cardiovascular and all-cause mortality with lower intelligence, but were attenuated in the fully adjusted models (fully adjusted HRs for cardiovascular mortality 1.92 (0.94 to 3.94) and 1.98 (0.89 to 4.37), respectively; for all-cause mortality 1.63 (1.00 to 2.65) and 1.62 (0.94 to 2.78), respectively). There was no increased risk for case-fatality at the first event (fully adjusted ORs 1.06 (0.73 to 1.55) and 0.97 (0.62 to 1.50), respectively).

CONCLUSIONS

Although we found lower intelligence to be associated with increased mortality in middle-aged men with CHD, there was no evidence for its possible effect on recurrence in CHD.

Challenges and opportunities: what can we learn from patients living with chronic musculoskeletal conditions, health professionals and carers about the concept of health literacy using qualitative methods of inquiry?

The field of health literacy continues to evolve and concern public health researchers and yet remains a largely overlooked concept elsewhere in the healthcare system. We conducted focus group discussions in England UK, about the concept of health literacy with older patients with chronic musculoskeletal conditions (mean age  = 73.4 years), carers and health professionals. Our research posed methodological, intellectual and practical challenges. Gaps in conceptualisation and expectations were revealed, reiterating deficiencies in predominant models for understanding health literacy and methodological shortcomings of using focus groups in qualitative research for this topic. Building on this unique insight into what the concept of health literacy meant to participants, we present analysis of our findings on factors perceived to foster and inhibit health literacy and on the issue of responsibility in health literacy. Patients saw health literacy as a result of an inconsistent interactive process and the implications as wide ranging; healthcare professionals had more heterogeneous views. All focus group discussants agreed that health literacy most benefited from good inter-personal communication and partnership. By proposing a needs-based approach to health literacy we offer an alternative way of conceptualising health literacy to help improve the health of older people with chronic conditions.

The effect of a community-based self-help multimodal behavioral intervention in Korean American seniors with high blood pressure

BACKGROUND

Great strides have been made in improving heart health in the United States during the last 2 decades, yet these strides have not encompassed many ethnic minority populations. There are significant health disparity gaps stemming from both a paucity of valid research and a lack of culturally sensitive interventions. In particular, many Korean Americans with chronic illnesses encounter difficulty navigating the healthcare system because of limited health literacy.

METHODS

The effect of a multimodal Self-Help Intervention Program on the Control of High Blood Pressure (HBP) was tested in a community-based clinical trial for Korean American seniors. Of 440 seniors enrolled, 369 completed the study (184 in the intervention group and 185 in the control group; mean age = 70.9±5.3 years). The intervention group received 6 weekly educational sessions on HBP management skill building, including health literacy training, followed by telephone counseling and home blood pressure (BP) monitoring for 12 months.

RESULTS

Findings support that the Self-Help Intervention Program on the Control of HBP was effective in controlling BP in this ethnic/linguistic minority population. The BP control rates for the intervention and control groups were 49.5% vs. 43.2% at baseline, 58.5% vs. 42.4% at 6 months, 67.9% vs. 52.5% at 12 months, and 54.3% vs. 53.0% at 18 months. Significant changes were observed over time in some psychobehavioral outcomes, including self-efficacy for BP control, medication adherence behavior, HBP knowledge, and depression.

CONCLUSIONS

The study findings suggest that the multimodal Self-Help Intervention Program on the Control of HBP is effective at promoting optimal HBP control for this ethnic/linguistic minority population.

CLINICAL TRIALS REGISTRY

NCT00406614.

Characteristics associated with postdischarge medication errors

OBJECTIVE

To examine the association of patient- and medication-related factors with postdischarge medication errors.

PATIENTS AND METHODS

The Vanderbilt Inpatient Cohort Study includes adults hospitalized with acute coronary syndromes and/or acute decompensated heart failure. We measured health literacy, subjective numeracy, marital status, cognition, social support, educational attainment, income, depression, global health status, and medication adherence in patients enrolled from October 1, 2011, through August 31, 2012. We used binomial logistic regression to determine predictors of discordance between the discharge medication list and the patient-reported list during postdischarge medication review.

RESULTS

Among 471 patients (mean age, 59 years), the mean total number of medications reported was 12, and 79 patients (16.8%) had inadequate or marginal health literacy. A total of 242 patients (51.4%) were taking 1 or more discordant medication (ie, appeared on either the discharge list or patient-reported list but not both), 129 (27.4%) failed to report a medication on their discharge list, and 168 (35.7%) reported a medication not on their discharge list. In addition, 279 participants (59.2%) had a misunderstanding in indication, dose, or frequency in a cardiac medication. In multivariable analyses, higher subjective numeracy (odds ratio [OR], 0.81; 95% CI, 0.67-0.98) was associated with lower odds of having discordant medications. For cardiac medications, participants with higher health literacy (OR, 0.84; 95% CI, 0.74-0.95), with higher subjective numeracy (OR, 0.77; 95% CI, 0.63-0.95), and who were female (OR, 0.60; 95% CI, 0.46-0.78) had lower odds of misunderstandings in indication, dose, or frequency.

CONCLUSION

Medication errors are present in approximately half of patients after hospital discharge and are more common among patients with lower numeracy or health literacy.

Effects of health literacy and polypharmacy on medication adherence

OBJECTIVE

To determine if health literacy has an effect on medication adherence in patients taking fewer than five prescriptions (no polypharmacy), and those taking five or more prescriptions (polypharmacy).

DESIGN

Retrospective cohort.

SETTING

The Primary Care Residents' Clinic at Virginia Commonwealth University Health System (VCUHS).

PATIENTS

Those who received a Rapid Estimate of Adult Literacy in Medicine-Revised (REALM-R) assessment at the clinic between June 1, 2009, and June 30, 2010, and utilized the VCUHS outpatient pharmacies to fill their prescriptions. A total of 648 individuals were identified.

INTERVENTIONS

The degree of health literacy and level of medication adherence were analyzed per patient by accessing the clinic's electronic health records. The number of medications each patient filled was determined using VCUHS outpatient pharmacy databases.

MAIN OUTCOME MEASURE

To determine if there are any associations among the degree of health literacy, the level of medication adherence, and the amount of medications a patient is taking.

RESULTS

There was a significant association found between the level of medication adherence and the degree of polypharmacy. We found no association between the degree of health literacy and the level of adherence to a prescribed medication regimen. Additionally, there was no relationship between the degree of polypharmacy and health literacy. Those patients with more medications were also found to have lower levels of medication adherence and vice versa.

CONCLUSION

Our study does not show an association between health literacy and medication adherence nor between health literacy and polypharmacy. Thus, potential changes to improving health literacy may not have a significant effect on adherence.