Validity of a self‐reported questionnaire for periodontal status in a Thai population

Despite being one of the most common diseases in humans, periodontal disease diagnosis is not easy at the individual and surveillance levels. Efforts have been made to assemble tools to ease the process, and questionnaires are an auspicious tool. This study aimed to validate the self-reported questionnaire developed by the US Centers for Disease Control and Prevention in collaboration with the American Academy of Periodontology for predicting periodontal disease in the Thai population. The validity of the questionnaires was assessed by comparing the self-reported responses to the data collected through a full-mouth examination by a third-year resident from the Periodontology Residency Training Program. In our study, questions related to signs of the disease showed promising validity as a predictive variable for periodontitis, especially its severe form, and the questionnaires performed better when used together with other questions, such as age and education level.