Validation of Hindi version of the Pittsburg Sleep Quality Index

Sleep quality is poorly understood in the Indian population. Lack of a suitable tool to assess sleep quality in Hindi language is the main reason behind this. Pittsburg sleep quality index (PSQI) is widely used in different population groups to assess subjective sleep quality over last one month.

To assess the reliability and validity of the Hindi translated version of Pittsburgh Sleep Quality Index (PSQI-H). gt;Methods: The PSQI-H was developed from PSQI according to following steps: (a) translation, (b) back-translation, (c) comparison between translation and back-translation performed by a group of experts, and (d) pre-pilot test in intended population. The PSQI-H was applied to 105 bilingual individuals knowing Hindi and English. The internal consistency of PSQI-H was assessed by Cronbach's alpha. For test-retest reliability assessment intraclass correlation coefficient (ICC) was measured between PSQI-H at baseline and PSQI after 4 weeks. The Pearson's coefficient was used to assess the correlation between the score of the questions and the PSQI-H scores.

The seven components of PSQI-H shows acceptable level of internal consistency with Cronbach's alpha of 0.776. There is good test-retest reliability between PSQI-H and PSQI as measured by ICC of 0.979. The score of individual items and global scores of PSQI-H were highly correlated with each other (p< 0.001). The mean of the seven individual components score and global scores of PSQI-H at baseline and original PSQI after 4 weeks did not differ significantly.

This study results demonstrate that the PSQI-H is a valid and reliable instrument for the assessment of sleep quality. PSQI-H can be used for the assessment of sleep quality in the predominantly Hindi speaking population.