| Males | Females | All | ||||
| Subjects | 28 | 42 | 70 | |||
| TST h | 5.6±1.2 (2.5–7.3) | 5.4±1.2 (1.9–7.7) | 5.5±1.2 (1.9–7.7) | |||
| N1 % TST | 12.7±16.1 (2.0–35.0) | 9.0±7.6 (1.0–86.0) | 10.4±11.8 (1.0–86.0) | |||
| N2 % TST | 78.3±16.4 (45.0–98.0) | 78.3±12.8 (14.0–95.0) | 75.7±14.6 (14.0–98.0) | |||
| N3 % TST | 8.8±10.1 (0.0–39.0) | 8.5±11.7 (0.0–44.0) | 8.6±11.0 (0.0–44.0) | |||
| REM stage % TST | 6.6±7.5 (0.0–36.0) | 4.3±5.9 (0.0–18.0) | 5.3±6.7 (0.0–36.0) | |||
Data are presented as n or mean±sd (range). TST: total sleep time; N1: stage N1 of non-rapid eye movement (REM) sleep as a percentage of TST; N2: stage N2 of non-REM sleep as a percentage of TST; N3: stage N3 of non-REM sleep as a percentage of TST; REM stage: REM stage of sleep as a percentage of TST.