Development and Validation of a Short Form Version of the Tuberculosis Medication Adherence Scale（TBMAS-SF）

Abstract

Background In this study, we utilized classical test theory (CTT) to develop and validate a concise, abbreviated version of the Tuberculosis Medication Adherence Scale (TBMAS-SF). This shortened version aims to enhance the reliability and validity of the measurement tool for tuberculosis patients while maintaining good psychometric properties. Methods A survey of tuberculosis patients undergoing treatment at the Heilongjiang Provincial Institute of Infectious Disease Control and Prevention was conducted using convenient sampling and the TBMAS. Data analysis was performed using SPSS 26.0 and Amos 24.0. A total of 496 questionnaires were distributed in this study, with 404 valid responses collected, resulting in an effective response rate of 81.45%. Results The analysis revealed that the TBMAS-SF has good reliability, with a Cronbach's α coefficient of 0.931 and a split-half reliability of 0.739. Confirmatory factor analysis indicated that the TBMAS-SF demonstrates good construct validity, with a chi-square degrees of freedom ratio of 4.981, RMSEA = 0.141, RMR = 0.014 (which is less than 0.05), CFI and IFI values exceeding 0.9, and NFI and TLI values approaching 0.9. There was a significant positive correlation between the TBMAS-SF score and medication literacy score (r = 0.228, p < 0.01), demonstrating the good empirical validity of the TBMAS-SF. Conclusion The TMAS-SF has good reliability and validity, making it a suitable tool for evaluating adherence to medical instructions among tuberculosis patients.