Does the PSQI correlate with Polysomnography in an Indian population?

The Pittsburgh Sleep Quality Index (PSQI) is a validated questionnaire to assess sleep quality. Polysomnography (PSG) objectively measures sleep quality with parameters such as sleep efficiency (SE) and wake after sleep onset (WASO). <bold>Aim:</bold> To test the association between PSQI and polysomnographic measures of sleep quality in adults from Mumbai, India <bold>Methods:</bold> Community-based participants were screened using self-administered PSQI and Epworth Sleepiness Scale(ESS). Those with PSQI score ≥ 5 and/or ESS score ≥ 10 were recruited, and overnight PSG was conducted. The data were analysed using STATA ver 14. <bold>Results:</bold> Mean age of participants was 40.2(SD 10.5) years; 79.6%(n=133) females. Mean PSQI was 7.53 (SD 3.07). Mean SE and sleep latency using PSG was 83.6% (SD 6.7)% and 39.6 (SD 26.1)min, respectively, correlating with derived values from the PSQI: 83.9 (SD 14.6)% and 30.7 (SD 29.3)min, respectively. The mean WASO with PSG was 43.5 (SD 30.7) min. 37.1 % participants (n=62) had mild sleep apnea, 12.6% (n=21) moderate sleep apnea and 5.4%(n=9) severe sleep apnea. PSQI had a significant correlation with sleep efficiency (r=-0.281, p=0.000) and with WASO (r=0.244, p=0.001) – Fig 1. Those in the third tertile of PSQI (>8) had the lowest sleep efficiency (81, SD 8.2%)., and longest WASO (53.7, SD 41.1 min). <bold>Conclusion:</bold> PSQI has a good correlation with PSG-derived sleep quality. There is a need to rule out sleep apnea if clinical suspicion is high. <fig><object-id>erj;64/suppl_68/PA2687/F1</object-id><object-id>F1</object-id><object-id>F1</object-id><graphic></graphic></fig>