Association of Sleep Quality With Fatigue in Post-COVID-19 Patients in an Indian Population.

Abstract

The aims of the study are to assess the quality of sleep in recently recovered COVID-19 and long-COVID cases and to determine its associations with fatigue and pain. Post-COVID-19 cases ( n = 201) and controls ( n = 206) were assessed using the Pittsburgh Sleep Quality Index questionnaire for sleep quality, Fatigue Severity Scale for fatigue, and Numeric Pain Rating Scale for pain in this observational study. Global Pittsburgh Sleep Quality Index score was higher ( P ≤ 0.001) among cases (5.7 ± 5.1; 95% confidence interval, 5.0-6.4) than controls (2.1 ± 2.0; 95% confidence interval, 1.8-2.4). Normal sleep latency was observed in 56 (27.9%) patients and 164 (79.6%) controls ( P < 0.001). Fatigue Severity Scale score was higher ( P ≤ 0.001) among cases (16.8 ± 10.2; 95% confidence interval, 15.4, 18.2) against controls (10.9 ± 4.1; 95% confidence interval, 10.3-11.4). The Fatigue Severity Scale scores in mild, moderate, and severe COVID-19 were 14.3 ± 8.1, 22.1 ± 10.8, and 22.8 ± 13, respectively ( P < 0.001) and higher in the older (20.7 ± 12.1) and middle-aged (19.6 ± 10.3) than in younger (13.9 ± 8.3) ( P ≤ 0.001) cases. The global Pittsburgh Sleep Quality Index score was positively correlated with the Fatigue Severity Scale ( r = 0.755, P < 0.001) and Numeric Pain Rating Scale scores ( r = 0.657, P < 0.001). Numeric Pain Rating Scale score correlated with Fatigue Severity Scale score ( r = 0.710, P < 0.001). Fatigue Severity Scale and global Pittsburgh Sleep Quality Index scores were higher in the long-COVID group ( P < 0.001). Significantly poor sleep quality was observed in post-COVID-19 individuals including long COVID being positively associated with fatigue and pain.