Validity of the PSQI

The validity of the Pittsburgh Sleep Quality Index (PSQI) was rigorously examined. Significant differences were observed in global PSQI scores between subject groups, with control subjects differing from patient groups. Further analysis demonstrated distinct profiles for different patient groups, reinforcing the PSQI’s ability to discriminate between varying levels of sleep disturbances. Covariate analysis confirmed the robustness of these findings, with age and sex having minimal impact on group differences.

Additionally, the PSQI’s validity was supported by its consistent performance in identifying individuals with sleep disturbances using a post hoc cutoff score. Comparative analysis with polysomnography further substantiated the PSQI’s validity, showing alignment with objective measures of sleep quality across various subject groups.

Overall, these findings underscore the PSQI’s reliability and utility in assessing sleep quality across diverse populations and contexts. More information on PSQI’s validity can be found in the original article.