Systematic review of the tools of oral and dental health literacy: assessment of conceptual dimensions and psychometric properties

Impact of an Oral Health Education Program on the Oral Health Literacy of Refugees

Inadequate comprehension of healthcare information contributes to poor health outcomes. Ethnic minorities are one of the populations most affected by low health and oral health literacy (OHL). The hypothesis of the current study was that an oral health education program (OHEP) can improve the OHL, oral health awareness and behaviors of refugees. We also hypothesized that there will be a difference between OHL in English and native language in the Pre-intervention phase. Fifty-two adult refugees participated in an educational program that included a comprehensive and culturally sensitive PowerPoint presentation and hands-on learning activities on oral health topics. The study used a cross-sectional pre-post study design. Before the program (Pre-intervention group), participants completed 2 surveys: Sociodemographic Survey and Oral Health Perceptions of Refugees in a bilingual format, and the Estimate of Oral Health Literacy-Bilingual40 (EOHL-BL40) in English, and in the participants' native language. Immediately after an OHEP (Post-intervention group), participants completed the EOHL-BL40 survey in English only. Two weeks after OHEP (Follow-up intervention), participants completed again the Sociodemographic Survey and Oral Health Perceptions of Refugees and the Estimate of Oral Health Literacy-Bilingual40 (EOHL-BL40) in English only. The mean percentage of words understood on Pre-intervention EOHL-BL40 survey were significantly higher in native languages (47.3% ±3.7%) compared with survey in English (15.3% ±1.2%, P < 0.001). Post-intervention scores, immediately after educational program, were higher (28.6% ±2.4%), P < 0.001) for survey in English compared with the Pre-intervention (15.3% ±1.2%). The follow-up (2 weeks later) scores (25.5% ±2.4) were slightly lower than Post-intervention but still significantly higher (P < 0.001) than Pre-intervention. Results for both Sociodemographic Survey and Oral Health Perceptions of Refugees surveys were similar: the OHEP positively affected oral health awareness and oral health behaviors. Results of the study suggested that OHEP may improve oral health literacy, oral health awareness, and personal oral hygiene practices of refugees.

The Association between Electronic Health Literacy and Oral Health Outcomes among Dental Patients in Saudi Arabia: A Cross-Sectional Study

OBJECTIVE

This cross-sectional study aimed to investigate the association between electronic health (eHealth) literacy and oral health outcomes, including the number of teeth and brushing frequency.

METHODS

A total of 478 participants were included in the study and assessed for their eHealth literacy levels. Demographic variables, including age, gender, income, and education, were collected. The participants' number of teeth and brushing frequency were also recorded. Multiple regression analyses were performed to examine the relationship between eHealth literacy and oral health outcomes, adjusting for sociodemographic variables.

RESULTS

The study sample consisted of both males (66.5%) and females (33.5%), with a mean age of 31.95 years. Among the participants, 16.95% were classified as having inadequate eHealth literacy, 24.06% had problematic eHealth literacy, and the majority (59.00%) demonstrated sufficient eHealth literacy. There was a significant association between eHealth literacy and oral health outcomes. Individuals with problematic eHealth literacy had a higher likelihood of having a greater number of teeth (RR = 1.12, 95% CI: 1.05-1.20, p < 0.001) compared to those with inadequate eHealth literacy. Similarly, individuals with sufficient eHealth literacy showed a higher likelihood of having more teeth (RR = 1.14, 95% CI: 1.07-1.21, p < 0.001) compared to the inadequate eHealth literacy group controlling for age, gender, income, and education. Individuals with problematic eHealth literacy exhibited a tendency towards lower odds of irregular brushing (OR = 0.39, 95% CI: 0.15-1.02, p = 0.054), although this result was marginally significant. In contrast, individuals with sufficient eHealth literacy had significantly lower odds of irregular brushing frequency (OR = 0.24, 95% CI: 0.10-0.62, p = 0.003) compared to the inadequate eHealth literacy group.

CONCLUSION

The findings suggest a positive association between eHealth literacy and oral health outcomes. Improving eHealth literacy may have implications for promoting better oral health behaviors and outcomes.

Associations of health literacy with dental care use and oral health status in Japan

BACKGROUND

The concept of health literacy has gained prominence in the context of oral health. In Japan, curative dental care is generally under universal health coverage, while preventive dental care requires effort. We used this situation to test the hypothesis that high health literacy is associated with preventive dental care use and good oral health status, but not with curative dental care use, in Japan.

METHODS

A questionnaire survey was conducted from 2010 to 2011 among residents aged 25-50 years in Japanese metropolitan areas. Data from 3767 participants were used. Health literacy was measured using the Communicative and Critical Health Literacy Scale, and the total score was categorized into quartiles. Poisson regression analyses with robust variance estimators were conducted to examine the associations of health literacy with curative dental care use, preventive dental care use, and good oral health, adjusted for covariates.

RESULTS

The percentages of curative dental care use, preventive dental care use, and good oral health were 40.2%, 28.8%, and 74.0%, respectively. Health literacy was not associated with curative dental care use; the prevalence ratio (PR) of the highest relative to the lowest quartile of health literacy was 1.04 (95% confidence interval [CI], 0.93-1.18). High health literacy was associated with preventive dental care use and good oral health; the corresponding PRs were 1.17 (95% CI, 1.00-1.36) and 1.09 (95% CI, 1.03-1.15), respectively.

CONCLUSIONS

These findings may provide clues for the design of effective interventions to promote preventive dental care use and improve oral health status.

Development of KROHL, a tool for evaluating oral health knowledge

Objectives

The authors aim to evaluate a scale assessing oral health knowledge, the KROHL (Knowledge Related to Oral Health Literacy) including the inter-rater reliability for scoring open-ended questions, internal consistency of the hypothesized scales, the discriminant validity of the resulting scale and its relationship to existing measures of oral health literacy.

Methods

The questionnaire was administered via face-to-face interviews to 144 volunteers recruited in the waiting areas of clinics throughout the NYU College of Dentistry.The KROHL questionnaire evaluates oral health knowledge by asking open-ended questions about the appearance, cause, treatment and prevention of caries, gum disease, oral cancer, tooth loss and malocclusion. Those 20 questions were scored to produce scale scores. Demographic information, a self-reported measure of HL and the CMOHK (Comprehensive Measure of Oral Health Knowledge) were also collected.Data were analyzed using Pearson correlation coefficients and principal components analysis, by computing Cronbach's alpha and Cohen's kappa, and by comparing group means with ANOVA.

Results

Kappa indicated good to excellent agreement among raters for the full and the individual subscales of the KROHL. Cronbach's alpha indicated good consistency of the full scale score, but not the individual scales. The mean (SD) KROHL score was lower in the patient group than in the dental students (13.3 (5.9) vs. 26.1 (4.7), p < .001), and varied directly with education level within the patients. KROHL scores were unrelated to existing measures of health literacy.

Conclusions

The KROHL scale is an innovative, reliable and valid tool to assess overall oral health knowledge and provide information to customize educational interventions. Further research is needed to determine the validity and reliability of the scale in multiple settings.

Innovation

The innovation of the KROHL tool of assessment of oral health knowledge lies in its ability to scale depth of knowledge within the domains of identification, causes, prevention, and treatment for the most common oral conditions.

Health literacy dimensions among public health service users with chronic diseases in Piracicaba, Brazil, 2019

Aim: This study analyzes factors associated with dimensions of health literacy (HL) functional, communicative and critical among public health service users with chronic non-communicable diseases. Methods: A cross-sectional analytical research was carried out in Piracicaba, São Paulo, Brazil, with adults and older adults attending Family Health Units (FHU). Data were collected by oral exam (CPOD and CPI) and a questionnaire on systemic conditions, sociodemographic factors, health behaviors and HLS (HLS-14). The outcomes consisted of functional, communicative, and critical HL dimensions dichotomized by median (high and low), which were analyzed by chi-square test (p<0.05) to find associations with the variables studied. Results: The study sample comprised 238 FHU users with 62.7 (± 10.55) mean age, of which 47.5% (n=113) showed high functional HL, 50.0% (n=119) high communicative HL, and 46.2% (n=110) high critical HL. High functional HL was associated with men (p<0.05). Functional and communicative HL were associated with having higher education (p<0.001 and p=0.018, respectively). High communicative and critical HL were associated with regular use of dental and medical services (p<0.05). Individuals with low functional HL were more likely to present poor tooth brushing (p=0.020). High HL (in all three dimensions) was associated with regular flossing and having more teeth (p<0.05). Conclusion: Functional, communicative and critical HL were associated with health behaviors and clinical outcomes, whereas the functional dimension was also associated with sociodemographic factors. HL dimensions allowed to differentiate health-related factors.

Measuring health literacy: A systematic review and bibliometric analysis of instruments from 1993 to 2021

BACKGROUND

It has been about 30 years since the first health literacy instrument was developed. This study aimed to review all existing instruments to summarize the current knowledge on the development of existing measurement instruments and their possible translation and validation in other languages different from the original languages.

METHODS

The review was conducted using PubMed, Web of Science, Scopus, and Google Scholar on all published papers on health literacy instrument development and psychometric properties in English biomedical journals from 1993 to the end of 2021.

RESULTS

The findings were summarized and synthesized on several headings, including general instruments, condition specific health literacy instruments (disease & content), population- specific instruments, and electronic health. Overall, 4848 citations were retrieved. After removing duplicates (n = 2336) and non-related papers (n = 2175), 361 studies (162 papers introducing an instrument and 199 papers reporting translation and psychometric properties of an original instrument) were selected for the final review. The original instruments included 39 general health literacy instruments, 90 condition specific (disease or content) health literacy instruments, 22 population- specific instruments, and 11 electronic health literacy instruments. Almost all papers reported reliability and validity, and the findings indicated that most existing health literacy instruments benefit from some relatively good psychometric properties.

CONCLUSION

This review highlighted that there were more than enough instruments for measuring health literacy. In addition, we found that a number of instruments did not report psychometric properties sufficiently. However, evidence suggest that well developed instruments and those reported adequate measures of validation could be helpful if appropriately selected based on objectives of a given study. Perhaps an authorized institution such as World Health Organization should take responsibility and provide a clear guideline for measuring health literacy as appropriate.

A psychometric network perspective to oral health literacy: Examining the replicability of network properties across the general community and older adults from Brazil

Objectives

To evaluate the replicability of oral health literacy (OHL) network models across the general community and a sample of older adults from Brazil.

Methods

Data were obtained from two oral health surveys conducted with a total of 1138 participants. OHL was measured using the short form Health Literacy in Dentistry scale (HeLD‐14). A regularized partial correlation network was estimated for each sample. Dimensionality and structural stability were examined via exploratory graph analysis. Network properties compared included global strength, edge weights, and centrality estimates. Model replicability was examined fitting the general community model to the older participants' data.

Results

Six dimensions with the exact same item composition were detected in both network models. Only the Receptivity domain in the older adults sample yielded low structural stability. Strong correlations were observed between edge weights (τ: 0.68; 95% CI: 0.62–0.74) and between node strength estimates (τ: 0.63; 95% CI: 0.36–0.89). No statistically significant differences were found for global strength. The fit of the older adults sample to the HeLD‐14 network structure of the general community sample was satisfactory.

Conclusion

Network models OHL replicated across the general community and a sample of older adults. The psychometric network approach is a useful tool to evaluate the measurement equivalence of OHL instruments across populations.

A Systematic Review of Cross-Cultural Adaptation and Psychometric Properties of Oral Health Literacy Tools

The aims of this systematic review were to critically appraise the quality of the cross-cultural adaptation and the psychometric properties of the translated versions of oral health literacy assessment tools. CINAHL (EBSCO), Medline (EBSCO), EMBASE (Ovid), and ProQuest Dissertation and Thesis were searched systematically. Studies focusing on cross-cultural adaptation and psychometric properties of oral health literacy tools were included. The methodological quality of included studies was assessed according to the COSMIN Risk of Bias checklist. Sixteen oral health literacy instruments in 11 different languages were included in this systematic review. However, only seven instruments met the criteria for an accurate cross-cultural adaptation process, while the remaining tools failed to meet at least one criterion for suitable quality of cross-cultural adaptation process. None of the studies evaluated all the aspects of psychometric properties. Most of the studies reported internal consistency, reliability, structural validity, and construct validity. Despite adequate ratings for some reported psychometric properties, the methodological quality of studies on translated versions of oral health literacy tools was mostly doubtful to inadequate. Researchers and clinicians should follow standard guidelines for cross-cultural adaptation and assess all aspects of psychometric properties for using oral health literacy tools in cross-cultural settings.

What influences the provision and reception of oral health education? A narrative review of the literature

OBJECTIVES

Most common diseases of the mouth are preventable through behavioural changes, oral hygiene routines and regular professional care. Research suggests dental professionals may prioritize clinical experience, personal values and preferences over evidence when delivering such interventions. Research also suggests variable rates of patient behaviour change following oral health education (OHE) interactions. This review explores the literature to answer the question: what factors influence the provision and reception of OHE messages and the wider OHE process?

METHODS

A structured search of literature was carried out with databases covering a range of academic disciplines (healthcare sciences, social sciences, education). Key words/terms were searched to elicit papers published since 1998. Citation mining (relevant citations within papers) and citation tracking (papers citing relevant papers) were also used. Recurring themes within the papers were identified and coded using NVivo12 and presented in a conceptual model.

RESULTS

The studies analysed tended to employ small-scale surveys, larger-scale surveys (some with low response rates), or interview studies of varying sizes. There was also a limited number of review papers. However, several key messages were identified regarding dental professionals' and patients' views on OHE and the factors that influence its provision. Factors that were identified related to the wider social and policy context (macro), community-level factors (meso), the individual practitioner and patient (micro), factors that influenced the nature of OHE interaction and any resulting behaviour change, and how the outcomes of the process influence future OHE interactions for both parties.

CONCLUSIONS

The literature highlighted how factors influence the OHE process before, during and after the educational interaction. The resultant conceptual model acknowledges the influence of wider 'upstream' factors alongside interpersonal and individual influences which should be taken into consideration when developing OHE interventions.

Explaining the concept of oral health literacy: Findings from an exploratory study

OBJECTIVES

Identifying those with inadequate oral health literacy is difficult because little is known about its various multiple dimensions. Accordingly, the present research investigated dimensions of the concept using a qualitative approach.

METHOD

Participants (n = 15) who met inclusion criteria (Including having expertise in the fields of general dental, social dental, and health education and health promotion and having at least 5 years of relevant working experience) were recruited by purposive sampling via the public health and dentistry faculty in Tehran between December 2018 and October 2019. Thematic analysis was used to assess the data.

RESULTS

A total of 15 specialists (ranging in age from 28 to 61, mean 44) were included in the study. Their working experience averaged 15.5 years (SD = 7.7, Min = 6, Max = 30). Independent analysis of qualitative data by three researchers led to identification of seven themes and 18 sub-categories, including need perception (feeling the need and paying attention to meeting the need), emotional literacy (valuation of oral health, formation of personality and taking care of oral health), planning literacy (planning and goal-orientation), communicative literacy (choice in decision-making, interpersonal communication skill and claiming), behavioural literacy (self-care), cognitive literacy (knowledge, information comprehension, information use, and information analysis) and media literacy (the ability to use up-to-date technologies, the ability to search for and acquire the information, and judgment).

CONCLUSIONS

Our findings provide insights into the dimensions of oral health literacy. It is hoped that these findings can be used to guide the development of interventions on OHL and that aspects of the concept can help to enhance levels of OHL and help to promote health at societal level.

Trends and developments in oral health literacy: a scientometric research study (1991-2020)

Objective

This study aimed to establish the current situation, intellectual base, hotspots, development trends, and frontiers of oral health literacy (OHL) from the literature.

Methods

We analyzed 1505 bibliographic records dated between January 1990 and December 2020 retrieved from the Web of Science Core Collection and the Scopus database. We used CiteSpace for word frequency analysis, co-occurrence analysis, co-citation analysis, clustering analysis, and burst analysis.

Results

The total number of publications increased year-on-year, with the majority of publications coming from the USA. Most studies focused on the relationship between (oral) health literacy and oral health, and the development of OHL instruments. The top 10 keywords by frequency were “health literacy”, “oral health”, “attitude to health”, “dental caries”, “adult”, “children”, “dental care”, “knowledge”, “questionnaire”, and “adolescent”. The keyword with the highest burst intensity was “dental health education”.

Conclusions

OHL research is a thriving field. The field is focused on the development of an OHL instrument and health promotion practice. Strategic cooperation among countries, institutions, authors, hospitals, and communities will be important to encourage further OHL research and address oral health problems.