Health literacy and health outcomes in diabetes: a systematic review

BACKGROUND

Low health literacy is considered a potential barrier to improving health outcomes in people with diabetes and other chronic conditions, although the evidence has not been previously systematically reviewed.

OBJECTIVE

To identify, appraise, and synthesize research evidence on the relationships between health literacy (functional, interactive, and critical) or numeracy and health outcomes (i.e., knowledge, behavioral and clinical) in people with diabetes.

METHODS

English-language articles that addressed the relationship between health literacy or numeracy and at least one health outcome in people with diabetes were identified by two reviewers through searching six scientific databases, and hand-searching journals and reference lists.

FINDINGS

Seven hundred twenty-three citations were identified and screened, 196 were considered, and 34 publications reporting data from 24 studies met the inclusion criteria and were included in this review. Consistent and sufficient evidence showed a positive association between health literacy and diabetes knowledge (eight studies). There was a lack of consistent evidence on the relationship between health literacy or numeracy and clinical outcomes, e.g., A1C (13 studies), self-reported complications (two studies), and achievement of clinical goals (one study); behavioral outcomes, e.g., self-monitoring of blood glucose (one study), self-efficacy (five studies); or patient-provider interactions (i.e., patient-physician communication, information exchange, decision-making, and trust), and other outcomes. The majority of the studies were from US primary care setting (87.5 %), and there were no randomized or other trials to improve health literacy.

CONCLUSIONS

Low health literacy is consistently associated with poorer diabetes knowledge. However, there is little sufficient or consistent evidence suggesting that it is independently associated with processes or outcomes of diabetes-related care. Based on these findings, it may be premature to routinely screen for low health literacy as a means for improving diabetes-related health-related outcomes.

Instrument-Defined Estimates of the Minimally Important Difference for EQ-5D-5L Index Scores

BACKGROUND

The five-level EuroQol five-dimensional questionnaire (EQ-5D-5L) is a preference-based measure of health-related quality of life (HRQOL), which yields an index score anchored at 0 (dead) and 1 (full health). We lack evidence on estimates for the minimally important difference (MID) of the EQ-5D-5L that will help in interpreting differences or changes in HRQOL measured by this scale score.

OBJECTIVES

To estimate the MID of the EQ-5D-5L index score for available scoring algorithms including algorithms from Canada, China, Spain, Japan, England, and Uruguay.

METHODS

A simulation-based approach based on instrument-defined single-level transitions was used to estimate the MID values of the EQ-5D-5L for each country-specific scoring algorithm.

RESULTS

The simulation-based instrument-defined MID estimates (mean ± SD) for each country-specific scoring algorithm were as follows: Canada, 0.056 ± 0.011; China, 0.069 ± 0.007; Spain, 0.061 ± 0.008; Japan, 0.048 ± 0.004; England, 0.063 ± 0.013; and Uruguay, 0.063 ± 0.019. Differences in MID estimates reflect differences in population preferences, in valuation techniques used, as well as in modeling strategies. After excluding the maximum-valued scoring parameters, the MID estimates (mean ± SD) were as follows: Canada, 0.037 ± 0.001; China, 0.058 ± 0.005; Spain, 0.045 ± 0.009; Japan, 0.044 ± 0.004; England, 0.037 ± 0.008; and Uruguay, 0.040 ± 0.010.

CONCLUSIONS

Simulation-based estimates of the MID of the EQ-5D-5L index score were generally between 0.037 and 0.069, which are similar to the MID estimates of other preference-based HRQOL measures.

Measuring health literacy in individuals with diabetes: a systematic review and evaluation of available measures

OBJECTIVE

To identify instruments used to measure health literacy and numeracy in people with diabetes; evaluate their use, measurement scope, and properties; discuss their strengths and weaknesses; and propose the most useful, reliable, and applicable measure for use in research and practice settings.

METHODS

A systematic literature review was conducted to identify the instruments. Nutbeam's domains of health literacy and a diabetes health literacy skill set were used to evaluate the measurement scope of the identified instruments and to evaluate their applicability in people with diabetes.

RESULTS

Fifty-six studies were included, from which one diabetes-specific (LAD) and eight generic measures of health literacy (REALM, REALM-R, TOFHLA, s-TOFHLA, NVS, 3-brief SQ, 3-level HL Scale, SILS) and one diabetes-specific (DNT) and two generic measures of numeracy (SNS, WRAT) were identified. These instruments were categorized into direct measures, that is, instruments that assess the performance of individuals on health literacy skills and indirect measures that rely on self-report of these skills. The most commonly used instruments measure selective domains of health literacy, focus mainly on reading and writing skills, and do not address other important skills such as verbal communication, health care system navigation, health-related decision making, and numeracy. The structure, mode, and length of administration and measurement properties were found to affect the applicability of these instruments in clinical and research settings. Indirect self- or clinician-administered measures are the most useful in both clinical and research settings.

CONCLUSION

This review provides an evaluation of available health literacy measures and guidance to practitioners and researchers for selecting the appropriate measures for use in clinical settings and research applications.

Minimally Important Difference of the EQ-5D-5L Index Score in Adults with Type 2 Diabetes

BACKGROUND

The EuroQol five-dimensional questionnaire (EQ-5D) is a generic preference-based measure of health-related quality of life, and several studies have made attempts to estimate the minimally important difference (MID) for the EQ-5D index score.

OBJECTIVES

To estimate the MID of the five-level EQ-5D (EQ-5D-5L) index score in a population-based sample of adults with type 2 diabetes and to explore whether the MID estimate varies by baseline index score and the direction of change in health status.

METHODS

We used longitudinal survey data of adults with type 2 diabetes in Alberta, Canada. The EQ-5D-5L MID was estimated first by the instrument-defined approach, which used the difference between the baseline index scores and the index scores of simulated single-level transitions, and then by the anchor-based approach, which categorized 1-year changes in depressive symptoms, diabetes-related distress, as well as physical and mental health functioning into no change, small change, and large change groups, wherein the MID was estimated as the average change in index score of the small change group.

RESULTS

Using the instrument-defined approach, MID estimates were 0.043, 0.040, and 0.045, whereas anchor-based MID estimates were 0.042, 0.034, and 0.049 for all change, improvement, and deterioration, respectively. Larger MID estimates were observed for lower baseline index scores and for deterioration in health status.

CONCLUSIONS

MID estimates of the EQ-5D-5L index score were consistent between instrument-defined and anchor-based approaches and ranged between 0.03 and 0.05. Estimates varied by baseline index score and the direction of change, with similar results for patient subgroups.

Collaborative care versus screening and follow-up for patients with diabetes and depressive symptoms: results of a primary care-based comparative effectiveness trial

OBJECTIVE

Depressive symptoms are common and, when coexisting with diabetes, worsen outcomes and increase health care costs. We evaluated a nurse case-manager-based collaborative primary care team model to improve depressive symptoms in diabetic patients.

RESEARCH DESIGN AND METHODS

We conducted a controlled implementation trial in four nonmetropolitan primary care networks. Eligible patients had type 2 diabetes and screened positive for depressive symptoms, based on a Patient Health Questionnaire (PHQ) score of ≥10. Patients were allocated using an "on-off" monthly time series. Intervention consisted of case-managers working 1:1 with patients to deliver individualized care. The main outcome was improvement in PHQ scores at 12 months. A concurrent cohort of 71 comparable patients was used as nonscreened usual care control subjects.

RESULTS

Of 1,924 patients screened, 476 (25%) had a PHQ score >10. Of these, 95 were allocated to intervention and 62 to active control. There were no baseline differences between groups: mean age was 57.8 years, 55% were women, and the mean PHQ score was 14.5 (SD 3.7). Intervention patients had greater 12-month improvements in PHQ (7.3 [SD 5.6]) compared with active-control subjects (5.2 [SD 5.7], P = 0.015). Recovery of depressive symptoms (i.e., PHQ reduced by 50%) was greater among intervention patients (61% vs. 44%, P = 0.03). Compared with trial patients, nonscreened control subjects had significantly less improvement at 12 months in the PHQ score (3.2 [SD 4.9]) and lower rates of recovery (24%, P < 0.05 for both).

CONCLUSIONS

In patients with type 2 diabetes who screened positive for depressive symptoms, collaborative care improved depressive symptoms, but physician notification and follow-up was also a clinically effective initial strategy compared with usual care.

Selection of patient-reported outcome measures (PROMs) for use in health systems

Many healthcare systems around the world have been increasingly using patient-reported outcome measures (PROMs) in routine outcome measurement to enhance patient-centered care and incorporate the patient's perspective in health system performance evaluation. One of the key steps in using PROMs in health systems is selecting the appropriate measure(s) to serve the purpose and context of measurement. However, the availability of many PROMs makes this choice rather challenging. Our aim was to provide an integrated approach for PROM(s) selection for use by end-users in health systems.The proposed approach was based on relevant literature and existing guidebooks that addressed PROMs selection in various areas and for various purposes, as well as on our experience working with many health system users of PROMs in Canada. The proposed approach includes the following steps: (1) Establish PROMs selection committee; (2) Identify the focus, scope, and type of PROM measurement; (3) Identify potential PROM(s); (4) Review practical considerations for each of the identified PROMs; (5) Review measurement properties of shortlisted PROMs; (6) Review patient acceptance of shortlisted PROMs; (7) Recommend a PROM(s); and (8) Pilot the selected PROM(s). The selection of appropriate PROMs is one step in the successful implementation of PROMs within health systems, albeit, an essential step. We provide guidance for the selection of PROMs to satisfy all potential usages at the micro (patient-clinician), meso (organization), and macro (system) levels within the health system. Selecting PROMs that satisfy all these purposes is essential to ensure continuity and standardization of measurement over time. This is an iterative process and users should consider all the available information from all presented steps in selecting PROMs. Each of these considerations has a different weight in diverse clinical contexts and settings with various types of patients and resources.

Comparative performance of the EQ-5D-5L and SF-6D index scores in adults with type 2 diabetes

PURPOSE

To explore the comparative performance including discriminative and longitudinal validity of EQ-5D-5L and SF-6D index scores in adults with type 2 diabetes.

METHODS

Data from an on-going cohort study of adults with type 2 diabetes in Alberta, Canada, were used. Known-groups approach was used to examine discriminative validity. Correlation and agreement indices and scatter and Bland-Altman plots were used to examine the relationship between the two measures. Longitudinal validity was explored using Wilcoxon signed-rank test, effect size, and standardized response mean.

RESULTS

In 1832 participants at baseline (age 64.3, standard deviation 10.6 years; 45% female), median EQ-5D-5L score was 0.85 [interquartile range (IQR) 0.17], and floor and ceiling effects of 0.1 and 16.1%, respectively; median SF-6D score was 0.72 (IQR 0.24), and floor and ceiling effects of 0.1 and 3.2%, respectively. EQ-5D-5L and SF-6D index scores were significantly correlated with an overall Spearman correlation coefficient of 0.73, and an ICC of 0.62 (95% CI 0.42-0.74). Both EQ-5D-5L and SF-6D scores demonstrated statistically significant differences in self-reported chronic conditions, depressive symptoms, and diabetes-related distress, and were able to detect changes in depressive symptoms and diabetes distress across all change groups.

CONCLUSIONS

Both EQ-5D-5L and SF-6D index scores provide valid measurement in this patient population. Considerable overlap between the measures means it is not necessary to include both in surveys, however, the advantages and disadvantages of each should be considered.

Controlled trial of a collaborative primary care team model for patients with diabetes and depression: rationale and design for a comprehensive evaluation

BACKGROUND

When depression accompanies diabetes, it complicates treatment, portends worse outcomes and increases health care costs. A collaborative care case-management model, previously tested in an urban managed care organization in the US, achieved significant reduction of depressive symptoms, improved diabetes disease control and patient-reported outcomes, and saved money. While impressive, these findings need to be replicated and extended to other healthcare settings. Our objective is to comprehensively evaluate a collaborative care model for comorbid depression and type 2 diabetes within a Canadian primary care setting.

METHODS/DESIGN

We initiated the TeamCare model in four Primary Care Networks in Northern Alberta. The intervention involves a nurse care manager guiding patient-centered care with family physicians and consultant physician specialists to monitor progress and develop tailored care plans. Patients eligible for the intervention will be identified using the Patient Health Questionnaire-9 as a screen for depressive symptoms. Care managers will then guide patients through three phases: 1) improving depressive symptoms, 2) improving blood glucose, blood pressure and cholesterol, and 3) improving lifestyle behaviors. We will employ the RE-AIM framework for a comprehensive and mixed-methods approach to our evaluation. Effectiveness will be assessed using a controlled "on-off" trial design, whereby eligible patients would be alternately enrolled in the TeamCare intervention or usual care on a monthly basis. All patients will be assessed at baseline, 6 and 12 months. Our primary analyses will be based on changes in two outcomes: depressive symptoms, and a multivariable, scaled marginal model for the combined outcome of global disease control (i.e., A1c, systolic blood pressure, LDL cholesterol). Our planned enrolment of 168 patients will provide greater than 80% power to observe clinically important improvements in all measured outcomes. Direct costing of all intervention components and measurement of all health care utilization using linked administrative databases will be used to determine the cost-effectiveness of the intervention relative to usual care.

DISCUSSION

Our comprehensive evaluation will generate evidence to reliability, effectiveness and sustainability of this collaborative care model for patients with chronic diseases and depression.

TRIALS REGISTRATION

Clinicaltrials.gov Identifier: NCT01328639.

Diabetic Foot Disease, Self-Care and Clinical Monitoring in Adults with Type 2 Diabetes: The Alberta's Caring for Diabetes (ABCD) Cohort Study

OBJECTIVE

To examine the prevalence and predictors of foot disease, self-care and clinical monitoring in adults with type 2 diabetes in Alberta, Canada.

METHOD

Baseline data from a prospective cohort of adults with type 2 diabetes were used. Assessment of foot disease included self-reported peripheral neuropathy, peripheral vasculopathy, foot or leg ulcer/infection or gangrene/amputation. Foot self-care was assessed using the Summary of Diabetes Self-Care Activities, and clinical monitoring using patients' reports of having feet checked for lesions or sensory loss.

RESULTS

The mean age of respondents (N=2040) was 64 (SD 10.7) years; 45% were female, and 91% were Caucasian. Peripheral neuropathy was reported by 18% of the respondents, peripheral vasculopathy by 28%, ulcer/infection by 6% and gangrene/amputation by 1.4%. Only 14% of respondents performed foot self-care behaviours ≥6 days per week, and only 41% and 34% had their feet clinically checked for lesions or sensory loss, respectively. Predictors of foot disease included longer duration of diabetes, smoking, depressive symptoms, low self-efficacy and a history of cardiovascular diseases. Predictors of good self-care included older age, female sex, longer duration of diabetes and no report of hyperlipidemia. Predictors of clinical monitoring included female sex, current smoking, residing in urban areas, longer duration of diabetes, and histories of heart disease or hyperlipidemia.

CONCLUSIONS

Peripheral neuropathy and vasculopathy were the most common reported foot problems in this population. Foot self-care is generally infrequent, and clinical monitoring is performed for less than half of these patients, with significant variations by patient demographics and clinical presentation.

Responsiveness of the EQ-5D-3L and EQ-5D-5L in patients following total hip or knee replacement

PURPOSE

To examine the responsiveness of the EQ-5D-3L and EQ-5D-5L among total hip/knee replacement (THR/TKR) patients.

METHODS

The EQ-5D (3L or 5L) and Western Ontario and McMaster University Osteoarthritis Index (WOMAC) have been routinely administered to all THR/TKR patients before and at 3 months after surgery in Alberta, Canada, since 2010. Patients were included in this analysis if they completed the WOMAC and the same version of EQ-5D at baseline and 3-month follow-up. The WOMAC was used as an anchor to categorize patients into 9 subgroups according to the relative change from baseline, i.e., no change, and 4 categories each for the amount of deterioration or improvement: large (≥ 70%), moderate (50% ≤ change < 70%), small but important (20% ≤ change < 50%), and very mild (0 < change ≤ 20%). The responsiveness of the EQ-5D-3L and EQ-5D-5L for each subgroup was assessed using effect size, standardized response mean, and Guyatt's Responsiveness Index.

RESULTS

A total of 1594 patients completed the EQ-5D-3L and WOMAC (60% females, mean age 66 years, N = 646 [41%] THR), and 3180 completed the EQ-5D-5L and WOMAC (60% females, mean age 66 years, N = 1352 [43.2%] THR) at baseline and 3-month follow-up. For both THR and TKR patients with "small but important" improvement, the EQ-5D-5L was consistently more responsive than the EQ-5D-3L.

CONCLUSION

Our study demonstrated that the EQ-5D-5L is more responsive than the EQ-5D-3L in identifying health-related quality of life changes in THR/TKR patients. We recommend using the EQ-5D-5L in longitudinal studies in this patient population.

Associations between health literacy and health outcomes in a predominantly low-income african american population with type 2 diabetes

Inadequate health literacy has been associated with poorer health behaviors and outcomes in individuals with diabetes or depression. This study was conducted to examine the associations between inadequate health literacy and behavioral and cardiometabolic parameters in individuals with type 2 diabetes and to explore whether these associations are affected by concurrent depression. The authors used cross-sectional data from a study of 343 predominantly African Americans with type 2 diabetes. Inadequate health literacy was significantly and modestly associated with diabetes knowledge (r = -0.34) but weakly associated with self-efficacy (r = 0.16) and depressive symptoms (r = 0.24). In multivariate regression models, there were no associations between health literacy and A1c, blood pressure, or body mass index or control of any of these parameters. There was no evidence that depression was an effect-modifier of the associations between health literacy and outcomes. Although inadequate health literacy was modestly associated with worse knowledge and weakly associated with self-efficacy, it was not associated with any of the cardiometabolic parameters the authors studied. Because this study showed no association between health literacy and behavioral and cardiometabolic outcomes, it is unseemly and premature to embark on trials or controlled interventions to improve health literacy for the purposes of improving patient-related outcomes in diabetes.

Contextualizing the Effectiveness of a Collaborative Care Model for Primary Care Patients with Diabetes and Depression (Teamcare): A Qualitative Assessment Using RE-AIM

OBJECTIVE

We evaluated the implementation of an efficacious collaborative care model for patients with diabetes and depression in a controlled trial in 4 community-based primary care networks (PCNs) in Alberta, Canada. Similar to previous randomized trials, the nurse care manager-led TeamCare intervention demonstrated statistically significant improvements in depressive symptoms compared with usual care. We contextualized TeamCare's effectiveness by describing implementation fidelity at the organizational and patient levels.

METHODS

We used the Reach, Effectiveness, Adoption, Implementation and Maintenance (RE-AIM) framework to evaluate TeamCare. Qualitative methods used to collect data regarding the RE-AIM dimensions of Implementation and Effectiveness included interviews with PCN staff and specialists (n=36), research team reflections (n=4) and systematic documentation. We used content analysis, and Nvivo 10 for data management.

RESULTS

TeamCare was implemented as intended but with suboptimal fidelity. Deviations from the model included limited degrees of collaborative care practised within the PCNs, including varying physician participation, limited comfort in practising collaborative care and discontinuity of care managers. Despite suboptimal fidelity, respondents identified several implementation facilitators at the organizational level: training, ongoing implementation support, professional and personal qualities of the care manager and pre-existing relationships. Without knowledge of the effectiveness of the intervention in our controlled trial, respondents anticipated improved patient outcomes due to the main intervention components, including active patient follow up, specialist consultation and treat-to-target principles.

CONCLUSIONS

Despite suboptimal implementation in Alberta's primary care context, TeamCare resulted in improved outcomes similar to those demonstrated in previous randomized trials. A stronger culture of collaborative care would likely have yielded greater implementation fidelity and possibly better outcomes.

Determinants of time trade-off valuations for EQ-5D-5L health states: data from the Canadian EQ-5D-5L valuation study

BACKGROUND

Previous studies suggest that population subgroups have different perceptions of health, as well as different preferences for hypothetical health states.

OBJECTIVE

To identify determinants of health states preferences elicited using time trade-off (TTO) for the 5-level EQ-5D questionnaire (EQ-5D-5L) in Canada.

METHODS

Data were from the Canadian EQ-5D-5L Valuation Study, which took place in Edmonton, Hamilton, Montreal, and Vancouver. Each respondent valued 10 of 86 hypothetical health states during an in-person interview using a computer-based TTO exercise. The TTO scores were the dependent variable and explanatory variables including age, sex, marital status, education, employment, annual household income, ethnicity, country of birth, dwelling, study site, health literacy, number of chronic conditions, previous experience with illness, and self-rated health.

RESULTS

Average [standard deviation (SD)] age of respondents (N = 1209) was 48 (17) years, and 45 % were male. In multivariable linear regression models with random effects, adjusted for severity of health states and inconsistencies in valuations, older age [unstandardized regression coefficient (β) = -0.077], male sex (β = 0.042), being married (β = 0.069), and urban dwelling (β = -0.055) were significantly associated with health states scores. Additionally, participants from Edmonton (β = -0.124) and Vancouver (β = -0.156), but not those from Hamilton, had significantly lower TTO scores than those from Montreal.

CONCLUSIONS

Socio-demographic characteristics were the main determinants of preferences for EQ-5D-5L health states in this study. Interestingly, preferences were significantly lower in western Canadian cities compared to eastern ones, bringing into question whether a single preference algorithm is suitable for use in all parts of Canada.

The relationship of diabetes-related distress and depressive symptoms with physical activity and dietary behaviors in adults with type 2 diabetes: A cross-sectional study

AIMS

Diabetes-related distress (DD) and depressive symptoms (DS) may influence self-management behaviors in people living with type 2 diabetes (T2D). We examined the association of DD and DS with physical activity (PA) and adherence to recommended dietary behaviors in adults with T2D.

METHODS

Using baseline data from 2040 adults with T2D in the Alberta's Caring for Diabetes (ABCD) cohort study, DD, DS, PA and adherence to dietary behaviors were assessed. A composite variable for presence of DD and DS was computed for analyses. ANOVA and logistic regression tested independent associations of DS and DD with PA and adherence to diet.

RESULTS

Participants were 64±10.6years, 45% female, 76% with annual household income≤$80,000, and 86% with high school education or more. Those with DD alone were 1.8 times (95% CI 1.1, 2.9) and those with DD and DS combined were 2.0 times (95% CI 1.1, 3.7) more likely not to meet PA guidelines compared to those without DD or DS. The presence of DS alone was not significantly associated with meeting PA guidelines (OR 1.4; 95% CI 0.7, 3.0). Compared to those without DD or DS, patients with DD alone (OR 1.5; 95% CI 1.4, 3.4), DS alone (OR 5.2; 95% CI 2.7, 9.7), or DD and DS combined (OR 2.5; 95% CI 1.6, 3.8) were more likely to have poor adherence to recommended dietary behaviors.

CONCLUSIONS

Greater distress or depressive symptoms were associated with worse self-management behaviors in adults with T2D. Attention to mental health status may improve participation in PA and adherence to diet recommendations in these patients.

Health Literacy, Pedometer, and Self-Reported Walking Among Older Adults

OBJECTIVES

We examined the association of health literacy with physical activity and physical activity guideline adherence in older adults.

METHODS

We used cross-sectional data from a 2012 population-based study in Alberta, Canada, assessing health literacy, and deriving moderate-to-vigorous physical activity (MVPA) and metabolic equivalent of task (MET) minutes per week from the Godin Leisure-Time Exercise Questionnaire, and steps per day via a pedometer.

RESULTS

Mean age of participants (n = 1296) was 66.4 (SD = 8.2) years, 57% were female, and 94% were White. Nine percent had inadequate health literacy, and 46% met guidelines for self-reported physical activity and 18% for steps per day. Participants with inadequate health literacy had nonsignificant adjusted decrements of 58 MVPA minutes and 218 MET minutes per week and were less likely to meet physical activity guidelines (MVPA: odds ratio = 0.63; 95% confidence interval [CI] = 0.41, 0.97; P = .037; MET: odds ratio = 0.65; 95% CI = 0.42, 1.01; P = .057) compared with their health-literate counterparts. Such differences were nonsignificant for steps per day.

CONCLUSIONS

Inadequate health literacy was associated with less likelihood of meeting MVPA guidelines based on self-reported physical activity, but not based on an objective measure of steps per day.

The performance of the EQ-5D-3L in screening for anxiety and depressive symptoms in hospital and community settings

BACKGROUND

To examine the performance of the EQ-5D-3L in screening for anxiety and depressive symptoms in hospital and community settings compared to other patient-reported screening tools.

METHODS

Data from a prospective cohort of patients discharged from general internal medicine wards from two hospitals in Edmonton, Alberta were used in this study. Two waves of measurements (discharge and 90-days post-discharge) were analyzed. The performance of the EQ-5D-3L was compared to other self-report screening tools: Generalized Anxiety Disorder 2-item questionnaire was used to categorize anxiety symptoms into absent (< 3) and present (≥ 3), and the Patient Health Questionnaire 9-items was used to categorize depressive symptoms by two severity cut-points: no (< 10) vs. mild (≥ 10), and no (< 15) vs. moderate-severe (≥ 15). Performance of EQ-5D-3L in screening for anxiety and depressive symptoms was evaluated using receiver operating curve (ROC) analysis.

RESULTS

Average age of participants (n = 493) was 62.9 years (SD 18.6); 51% were female. At discharge, 30.0% screened positive for mild and 12.8% for moderate-severe depressive symptoms, while 27.6% screened positive for anxiety symptoms. For co-morbid symptoms, 17.1% screened positive for anxiety and any depressive symptoms, while 10.8% for anxiety and moderate-severe depressive symptoms. While the EQ-5D-3L had limited screening ability in hospital, the anxiety/depression dimension performed well in the community setting (90-days post-discharge) in screening for anxiety (area under ROC 0.79), depressive symptoms (any: 0.78, moderate-severe: 0.84), and a combination of both (any: 0.86; moderate-severe: 0.91).

CONCLUSIONS

The EQ-5D-3L anxiety/depression dimension could be a useful tool in screening for anxiety and depressive symptoms in community settings compared to other self-report screening tools. The usefulness of the EQ-5D-3L as a screening tool in other settings and populations is warranted.

Applying the RE-AIM framework to the Alberta's Caring for Diabetes Project: a protocol for a comprehensive evaluation of primary care quality improvement interventions

INTRODUCTION

Diabetes represents a major public health and health system burden. As part of the Alberta's Caring for Diabetes (ABCD) Project, two quality-improvement interventions are being piloted in four Primary Care Networks in Alberta. Gaps between health research, policy and practice have been documented and the need to evaluate the impact of public health interventions in real-world settings to inform decision-making and clinical practice is paramount. In this article, we describe the application of the RE-AIM framework to evaluate the interventions beyond effectiveness.

METHODS AND ANALYSIS

Two quality-improvement interventions were implemented, based on previously proven effective models of care and are directed at improving the physical and mental health of patients with type-2 diabetes. Our goal is to adapt and apply the RE-AIM framework, using a mixed-methods approach, to understand the impact of the interventions to inform policy and clinical decision-making. We present the proposed measures, data sources and data management and analysis strategies used to evaluate the interventions by RE-AIM dimension.

ETHICS AND DISSEMINATION

Ethics approval for the ABCD Project has been granted from the Health Research Ethics Board (HREB #PRO00012663) at the University of Alberta. The RE-AIM framework will be used to structure our dissemination activities by dimension.

RESULTS

It will be presented at relevant conferences and prepared for publication in peer-reviewed journals. Various products, such as presentations, briefing reports and webinars, will be developed to inform key stakeholders of the findings. Presentation of findings by RE-AIM dimension will facilitate discussion regarding the public health impact of the two interventions within the primary care context of Alberta and lessons learned to be used in programme planning and care delivery for patients with type-2 diabetes. It will also promote the application of evaluation models to better assess the impact of community-based primary healthcare interventions through our dissemination activities.

Discriminative validity of the EQ-5D-5 L and SF-12 in older adults with arthritis

Background

The EQ-5D-5 L and the SF-12 are the most commonly used generic measures of health-related quality of life among people with arthritis. However, there is little evidence on the extent to which the individual dimensions and domains of these instruments perform among this population. The objective was to examine the discriminative validity of the EQ-5D-5 L and the SF-12 version 2 (and SF-6D) in capturing the burden of arthritis on health-related quality of life in older adults.

Methods

Cross-sectional data from the Alberta Retired Teachers Association survey were used. A known-groups approach, with a-priori hypotheses, was used to examine the discriminative validity of the domain and summary scores of the EQ-5D-5 L and the SF-12 version 2 (and SF-6D). Groups were defined based on self-reported of arthritis, chronic pain level, presence and number of comorbidities, and self-reported health status.

Results

Mean age of respondents (N = 2844) was 68.6 (standard deviation [SD] 5.9) years; 54.8% were female, with mean body mass index (BMI) of 27.2 kg/m² (SD 4.8), and 36.6% reported having arthritis. The overall mean EQ-5D-5 L index score was 0.86 (SD 0.11) and that of SF-6D was 0.79 (SD 0.13). Participants with arthritis had lower EQ-5D-5 L index score (0.83, SD 0.13) and SF-6D index score (0.75, SD 0.13) compared to those without arthritis (0.88, SD 0.09 and 0.81, SD 0.12, respectively). EQ-5D-5 L and SF-6D index scores demonstrated moderate discriminative validity with a moderate effect size (0.5). Related dimensions and domains between the EQ-5D-5 L and SF-12 (e.g., mobility with physical functioning score, pain/discomfort with bodily pain and anxiety/depression with mental health) were moderately to strongly correlated (r = 0.6–0.7). Both instruments could not adequately discriminate between participants with moderate and severe chronic pain of 6-month duration.

Conclusion

Overall, the EQ-5D-5 L pain/discomfort and mobility dimensions, and the SF-12 bodily pain scale had moderate discriminative ability among older adults with arthritis. However, both instruments had limited discriminative ability for chronic pain. The importance and nature of chronic pain assessment in a given application need to be considered when choosing any of these instruments for measuring health-related quality of life in this patient population.

Electronic supplementary material

The online version of this article (10.1186/s12955-019-1129-6) contains supplementary material, which is available to authorized users.

Cost-Effectiveness Evaluation of Collaborative Care for Diabetes and Depression in Primary Care

INTRODUCTION

Information is limited on the cost effectiveness of strategies to improve depressive symptoms in patients with Type 2 diabetes in primary care outside of the U.S.

METHODS

Using patient data from a 12-month controlled implementation trial, outcomes and healthcare costs determined through administrative database linkages were compared for a strategy of family physician notification and follow-up ("enhanced care") versus collaborative care. Two measures of effectiveness were used: depression-free days (DFDs) based on Patient Health Questionnaire, and quality-adjusted life years (QALYs) based on EQ-5D. Data were collected November 2010 to January 2013 with analyses completed in May 2015. Incremental cost-effectiveness ratios were also compared against true usual care patients.

RESULTS

Among 227 patients, mean age was 58 years, 55% were female, and mean diabetes duration was 12 years. Compared with total 12-month cost per usual care patient (C$5,889), the incremental cost was C$450 for patients in enhanced care and C$1,021 for collaborative care. Both enhanced and collaborative care strategies improved outcomes compared with usual care, with incremental DFDs of 65.9 and 117.6, and incremental QALYs of 0.006 and 0.042, respectively. Compared with enhanced care, collaborative care yielded incremental cost-effectiveness ratios of C$11/DFD and C$15,861/QALY. Compared with usual care, the incremental cost-effectiveness ratios were C$7/DFD or C$76,271/QALY for enhanced care and C$9/DFD or C$24,368/QALY for collaborative care.

CONCLUSIONS

In primary care patients with Type 2 diabetes who screened positive for depression, physician notification and follow-up was a clinically effective strategy compared with usual care, but investing more resources in collaborative care yielded the most cost-effective strategy.

Characteristics and health behaviors of diabetic patients receiving influenza vaccination

OBJECTIVE

Epidemiological research has posited a 'healthy user' bias in patients receiving influenza vaccination; thus we sought to evaluate potential healthy-user attributes and their associations with influenza vaccination.

RESEARCH DESIGN & METHODS

Between 2011 and 2013, adults with type 2 diabetes were enrolled in a prospective cohort in Alberta, Canada. Information collected included sociodemographics, diabetes-related data (e.g., duration, complications), health behaviors (e.g., smoking status), functional health status, and satisfaction with healthcare. Data were collected by a mailed, self-administered survey. Multivariable logistic regression analyses were used to identify potential healthy-user attributes independently associated with influenza vaccination.

RESULTS

From a cohort of 2040 patients, 1287 (63%) reported receiving the influenza vaccine in the previous year. Average age of the cohort was 64 years (standard deviation 11) and 55% were male. In multivariable analysis, attributes independently associated with influenza vaccination included receiving preventive medications: aspirin (64% vs 44%; adjusted odds ratio, aOR 1.65, 95% CI 1.34-2.04); blood pressure medications (76% vs 56%; aOR 1.36, 95% CI 1.07-1.71); and cholesterol-lowering medications (74% vs 53%; aOR 1.50, 95% CI 1.19-1.89), as well as having a healthcare professional check feet for lesions (47% vs 31%; aOR 1.39, 95% CI 1.12-1.74). Additional covariates independently associated with influenza vaccination included: age over 65 years, respiratory disease, the number of additional comorbidities, and higher ratings of healthcare experience.

CONCLUSION

Vaccinated diabetic patients exhibit many postulated attributes of 'healthy users', which has implications for the interpretation of epidemiological studies of influenza vaccine effectiveness, as well as targeting future vaccination campaigns.