Pittsburgh sleep quality index
psychiatric, daytime dysfunction
The Pittsburgh Sleep Quality Index (PSQI) is widely used in different populations as one of the best tools to measure sleep quality during the month before evaluation. This self‐assessment questionnaire has 7 subscales (subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medication, and daytime dysfunction) and 19 individual items, where each item has a 4‐point Likert scale from 0 to 3 (Buysse et al., In a study in Iran among psychiatric patients along with the control group to evaluate the reliability and validity of the Persian version of this questionnaire, Cronbach's alpha coefficient for all subjects, the patient group, and the control group were reported as 0.77, 0.52, and 0.78, respectively. Also, the sensitivity and specificity of the questionnaire at cut‐off point 5 were 94% and 72%, respectively, which is acceptable for use in the Iranian population (Farrahi Moghaddam et al., 