Table 3. Descriptive statistics for each PSQI component for each study.
| Mean score | Test-retest coefficient† | |||||
| Study 1(N = 213) | Study 2(N = 190) | Study 3(N = 270) | Study 1(N = 75) | Study 2(N = 89) | Study 3(N = 171) | |
| Bed time ‡ (sd/range) | 23∶50(56/21∶30–02∶30) | 23∶53(48/22∶00–02∶00) | 24∶05(40/22∶30–03∶00) | .735*** | .713*** | .633*** |
| Rise time ‡ (sd/range) | 07∶12(40/05∶00–10∶30) | 07∶20(47/05∶00–10∶00) | 07∶14(40/06∶00–10∶00) | .836*** | .766*** | .648*** |
| Sleep duration ‡ (sd/range in hours) | 06∶47 (55/4.5–10) | 06∶47 (50/4.5–10) | 06∶40 (46/3.5–9) | .584*** | .580*** | .605*** |
| Component 1 Subjective sleep quality (sd) | 1.04 (.67) | 1.00 (.65) | 1.02 (.68) | .590*** | .431*** | .502*** |
| Component 2 Sleep latency (sd) | .96 (.90) | .88 (.83) | .87 (.88) | .762*** | .538*** | .636*** |
| Component 3 Sleep duration (sd) | .85 (.60) | .88 (.56) | .92 (.48) | .579*** | .421*** | .414*** |
| Component 4 Habitual sleep efficiency (sd) | .17 (.45) | .21 (.46) | .15 (.43) | .368** | .304** | .052 |
| Component 5 Sleep disturbances (sd) | .98 (.48) | .99 (.48) | .84 (.43) | .189 | .428*** | .310*** |
| Component 6 Medication use (sd) | .03 (.19) | .03 (.20) | .01 (.09) | − | − | −.015 |
| Component 7 Daytime dysfunction (sd) | 1.81 (.87) | 1.84 (.86) | 2.02 (.76) | .505*** | .591*** | .488*** |
| Global Score (sd) | 5.84 (2.57) | 5.83 (2.31) | 5.82 (2.19) | .770*** | .539*** | .613*** |
| % PSQI Global score >5 (male/female) | 49.3 (51.4/48.2) | 56.8 (57.7/56.5) | 52.2 (52.7/52) | − | − | − |
†
Pearson, two-tailed.
*p≤.05;
**p≤.01;
***p≤.0005.
‡
Clock times; sd in minutes.