Development and Validation of Oral Health Literacy Questionnaire for Thai Adults

AIM: The purpose of the study was to develop a valid and reliable oral health literacy questionnaire for the Thai adults. It measures functional, communicative, and critical competency, covering four competencies according to the context of daily living, namely, oral health service, home and community, marketplace, and community public forums. MATERIALS AND METHODS: A cross-sectional study was carried out in 420 Thai adults who were the dental clients of an oral health service system. Subjects were recruited into the study by multistage stratified random sampling. Data were collected by interviewing using the newly developed oral health literacy questionnaire. After checking for the completeness and correctness of the data, the validity and reliability of the questionnaire were analyzed by calculation of the sensitivity, specificity, and positive predictive and negative predictive values. Receiving-operating characteristic (ROC) curve was performed and showed the area under ROC that indicates the diagnostic performance of the questionnaire. RESULTS: High reliability was found as Cronbach’s alpha = 0.878 and the validity proved by known-group method, presented as ability to classify subjects as having adequate, or inadequate oral health literacy was also high, given the sensitivity = 0.853, the specificity = 0.848, and the area under ROC curve = 0.858. CONCLUSION: The newly developed oral health literacy questionnaire for Thai adults was valid and reliable.