Table 1.
Descriptives of questionnaire and sleep data.
| Variable | Min | Max | Mean | SD |
|---|---|---|---|---|
| Participant characteristics | ||||
| Age (years) | 19 | 33 | 23.6 | 2.9 |
| BMI (kg/m2) | 19.1 | 24.1 | 21.9 | 1.4 |
| SCL-90-R (T-value) | 27 | 55 | 38.1 | 5.8 |
| PSQI (sum score) | 1 | 5 | 3.3 | 1.2 |
| Sleep stages | ||||
| S1 (min) | 4.5 | 28.5 | 13.8 | 7.0 |
| S2 (min) | 2.0 | 63.0 | 34.6 | 14.3 |
| S3 (min) | 0.0 | 12.0 | 5.4 | 3.7 |
| S4 (min) | 0.0 | 46.5 | 9.8 | 11.7 |
| REM (min) | 0.0 | 16 | 4.4 | 5.2 |
| SWS (min) | 0.0 | 50.5 | 15.2 | 13.3 |
| TST (min) | 7.5 | 91.0 | 68.0 | 21.6 |
| Latency (min) | 4.4 | 62.7 | 13.8 | 11.4 |
| Efficiency (%) | 8.3 | 97.5 | 74.3 | 23.5 |
BMI, body mass index; SCL-90-R, T-value of the global severity index of the Symptom-Checklist-90-R; PSQI, sum score of the Pittsburgh-Sleep-Quality Index; S1–S4, sleep stages 1–4 according to Rechtschaffen and Kales (1968); REM, REM-sleep; SWS, slow-wave sleep, i.e., S3 + S4; TST, total sleep time; Latency, sleep-latency to S2; efficiency = 100 ∗ TST/time in bed.