Table 4. Comparison of Pittsburgh Sleep Quality Index (PSQI) components between normal (NS) and poor sleepers (PS).
| PSQI component score | Mean rank | U/t | p-value | |
|---|---|---|---|---|
| NS | PS | |||
| DURAT | 23.8 | 24.3 | 265.0 | 0.906 |
| DISTB | 20.5 | 28.7 | 176.0 | 0.008 |
| LATEN | 17.9 | 32.2 | 105.5 | <0.001 |
| DAYDYS | 19.3 | 30.4 | 142.0 | 0.004 |
| HSE | 20.9 | 28.2 | 185.5 | 0.038 |
| SLPQUAL | 17.4 | 32.9 | 92.0 | <0.001 |
| PSQI global* | 4.9±2.0 | 9.1±3.6 | -4.65 | <0.001 |
*Mean±SD; DURAT: Sleep duration; DISTB: Sleep disturbance; LATEN: Sleep latency; DAYDYS: Day dysfunction due to sleepiness; HSE: Sleep efficiency; SLPQUAL: Overall sleep quality; PSQI global: Pittsburgh sleep quality index global score; Independent t-test applied for PSQI global score and Mann Whitney U test applied for component score