Specialized Questionnaire of the QAA-25 Questionnaire System for Assessing the Potential Adherence to Treatment of Adolescents Aged 12–14 Years: Reliability and Internal Stability

The aim of the study is assess the reliability, internal stability and effectiveness of adaptation of individual questions of the QAA-25 questionnaire to assess the potential adherence to treatment of persons aged 12–14 years, in comparison with a similar QAA-25 questionnaire for persons aged 15–17 years. Material and Methods. In a descriptive observational study, including 314 students of general schools in Omsk the level of treatment adherence was determined using the QAA-25 questionnaire, using traditional and alternative formulations of individual questions. Results. For adolescents aged 12–14 years a good diagnostic value was shown higher individual testing quality (absence of blank answers to questions) of the tested version of the questionnaire compared to the alternative one. 96.8% of respondents indicated that the wording of the specialized questionnaire was “more accurate” and “more correct”. The tested version of the questionnaire demonstrated good reliability (Cronbach’s alpha total 0.901, based on standardized items αst 0.914) with high internal consistency (consistent elimination of scale items maintains questionnaire validity in the 0.886–0.909 range), with near perfect expert agreement (Cohen’s kappa 0.908). Conclusion. The questionnaire is characterized by good validity and has a high internal stability, and the content and wording of all questions of the questionnaire are adequately perceived by the audience for which the questionnaire is designed. This makes it advisable to use it to assess the potential adherence to treatment of adolescents aged 12–14 years.