Abstract: Objective: To assess the reliability and validity of Pittsburgh Sleep Quality Index (PSQI) and investigate the sleep quality status among civil servants in Tianjin. Method: The participants were selected randomly from civil servants in Tianjin by using stratified cluster sampling method and investigated with PSQI, 3 610 valid samples were obtained. The reliability and validity of PSQI was evaluated by calculating the split-half reliability, Cronbach’s alpha coefficient, construct validity and discriminate validity. Result: The average score of PSQI is 4.53±2.96, the incidence of sleep disorders is 13.82%. Mean difference of PSQI score between different age, education, marital status, family income groups is statistically significant, while no difference is found between gender groups. The split-half reliability of PSQI is 0.881, Cronbach’s α coefficient is 0.746. Factor analysis produced three components which explained 52.91% of total variance. Most items have a higher factor loading in one of the three factors, while relatively lower in other factors. Conclusion: The incidence of sleep disorders is rather high in Tianjin civil servants, PSQI has good reliability and validity.

Key words: Pittsburgh Sleep Quality Index, sleep quality, civil servant, reliability, validity