Cross-cultural adaptation and psychometric evaluation of Pittsburgh sleep quality index Bangla (PSQI-BN) in Bangladeshi population.

The Pittsburgh sleep quality index (PSQI) is one of the most widely used instruments to assess sleep quality. This study aimed to translate the PSQI into Bangla (PSQI-BN) and evaluate its psychometric properties among Bangladeshi population. This cross-sectional study was conducted in two phases. In the first phase, the PSQI was translated into Bangla following standard guidelines. In the second phase, the psychometric properties of the PSQI-BN were evaluated, including content validity, construct validity (convergent and divergent), internal consistency, and test-retest reliability. An exploratory factor analysis was also conducted. A sample of 148 apparently healthy individuals were included in the study. The PSQI-BN demonstrated moderate internal consistency (Cronbach's α = 0.619) and strong test-retest reliability (Spearman's ρ = 0.842, p < 0.001). The PSQI-BN total score showed a moderate positive correlation (ρ = 0.369, p < 0.001) with the Insomnia Severity Index-Bangla, indicating convergent validity, and a weak positive correlation (ρ = 0.286, p < 0.001) with the Perceived Stress Scale, suggesting divergent validity. Exploratory factor analysis revealed a four-factor structure, representing onset and fragmentation, sleep sufficiency, subjective restoration, and medication-assisted sleep. The biplot analysis confirmed the representation of each component within the factor structure, with sleep duration, sleep latency, sleep disturbance, and sleep efficiency having the highest representation. This study provides initial evidence supporting the reliability and validity of the PSQI-BN as a measure of sleep quality in the Bangladeshi population. The availability of a culturally adapted and psychometrically evaluated Bangla version of the PSQI will facilitate high-quality sleep research and clinical applications in Bangladesh.