RESULTS: A total 400 patients were recruited. 77 cases were excluded from the study due to incomplete data. Two patients withdrew from the study. As a result, 321 patients had all data for evaluation. Most of them (307) were male and only 14 were female. The mean age was 60.6 years with a standard deviation of 12.7. Among the 321 evaluated patients, 160 were classified as compliant. In the univariate analyses, older age (>65), profession, PAP type, side effect, efficiency and Behavioral Activation System Fun Seeking (BAS FS), BMI, Apnea-Hypopnea Index (AHI) were significantly associated with PAP adherence. A multivariate analysis revealed that profession, PAP type, efficiency, age, BAS FS are still significant predictors after adjusting for other covariates. A further analysis with total usage time and days without usage also showed significant association with adherence for Intellect Imagination and Negative Affect respectively by Pearson correlation.