Psychometric properties of the Persian version of the treatment satisfaction questionnaire for medication (TSQM) among Iranian hypertensive patients

ObjectiveThis study aimed to evaluate the psychometric properties of the Persian version of the TSQM-14 in patients with hypertension in IranMethodsThis cross-sectional study was conducted among hypertensive patients referred to primary healthcare centers in Kerman City between January and February 2021. Cronbach's alpha and total-item correlation were used to evaluate internal consistency, while the Intraclass Correlation Coefficient (ICC) was employed to assess test-retest reliability. Construct validity was examined using structural equation modeling (SEM), known-groups validity, and convergent validity.ResultsA total of 319 participants took part in the study, with a mean age of 56.7 years (SD = 13.0), and 57.7% (n = 184) were female. The Cronbach's alpha and ICC values of the TSQM-14 for the composite scales were 0.83 and 0.91, respectively, indicating good reliability. The SEM indices for TSQM-14 demonstrated adequate model fit, with χ² = 118.9 (P ≤ 0.001), CFI = 0.96, RMSEA = 0.07, TLI = 0.95, and NFI = 0.91. The mean (standard deviation (SD)) scores of the composite scale for patients in the uncontrolled group (systolic blood pressure ≥140 mmHg or diastolic blood pressure ≥90 mmHg) and the controlled group were 50.2 (SD = 6.6) and 47.6 (SD = 6.1), respectively (P = 0.021). Additionally, the Spearman correlation coefficient between the TSQM-14 scale and the MMAS-8 was 0.30 (P < 0.001), demonstrating a weak but significant correlation.ConclusionsThis study demonstrated that the Persian version of the TSQM-14 has acceptable reliability, as well as construct and convergent validity, for assessing treatment satisfaction among hypertensive patients.