Table 4.
—Polysomnographic Variables by Sleep Diagnoses
| Variable | Overall (N = 110) | Insomnia (n = 28) | Comorbid (n = 42) | OSA (n = 27) | Control Subjects (n = 13) | F | P Value |
| SOL, min | 10.3 ± 15.3 | 12.9 ± 22.6 | 12.6 ± 15.2 | 5.3 ± 4.9 | 7.5 ± 6.0 | 1.72 | .168 |
| REM latency, min | 114.6 ± 78.3 | 145.1 ± 93.2a | 114.7 ± 77.2 | 79.6 ± 54.4a | 121.0 ± 66.3 | 3.47 | < .05 |
| TST, min | 422.9 ± 57.1 | 422.7 ± 50.7 | 421.9 ± 59.7 | 420.1 ± 64.1 | 432.4 ± 51.8 | 0.14 | .935 |
| Sleep efficiency, % | 91.3 ± 6.7 | 90.6 ± 9.0 | 90.3 ± 7.0 | 92.4 ± 3.5 | 93.7 ± 4.0 | 1.25 | .296 |
| Stage N1, % | 11.3 ± 7.0 | 9.4 ± 4.7 | 11.8 ± 5.5 | 13.8 ± 11.0 | 8.7 ± 3.3 | 2.51 | .063 |
| Stage N2, % | 43.5 ± 9.1 | 44.1 ± 8.8 | 43.3 ± 9.6 | 43.4 ± 10.3 | 43.1 ± 5.8 | 0.06 | .981 |
| Stage N3, % | 19.7 ± 9.2 | 20.7 ± 9.1 | 18.8 ± 8.6 | 18.9 ± 10.7 | 21.7 ± 8.3 | 0.53 | .660 |
| Stage R, % | 18.6 ± 8.3 | 16.7 ± 6.4 | 17.7 ± 6.2 | 21.4 ± 12.4 | 20.1 ± 5.9 | 1.88 | .137 |
| WASO, min | 38.0 ± 29.0 | 41.3 ± 40.1 | 41.9 ± 28.0 | 33.6 ± 19.6 | 27.7 ± 16.6 | 1.14 | .338 |
| Arousal index | 21.8 ± 16.7 | 15.5 ± 10.3a | 22.3 ± 13.5 | 31.2 ± 25.0a,b | 14.8 ± 5.1b | 5.42 | < .01 |
| Apnea-hypopnea index | 13.4 ± 17.3 | 2.0 ± 1.4a,b | 14.7 ± 11.1a,c,d | 28.7 ± 24.5b,c,e | 1.9 ± 1.5d,e | 20.06 | < .001 |
| Desaturation, % | 86.0 ± 6.2 | 90.4 ± 3.8a,b | 84.0 ± 5.2a,c | 83.3 ± 7.3b,d | 88.8 ± 4.7c,d | 11.27 | < .001 |
| Self-reported sleep duration, h | 5.3 ± 1.7 | 5.5 ± 2.0 | 5.0 ± 1.3 | 5.4 ± 1.7 | 5.8 ± 2.0 | 0.88 | .457 |
Data are presented as mean ± SD. Desaturation = minimum recorded oximetry value during sleep; REM = rapid eye movement; SOL = sleep onset latency; TST = total sleep time; WASO = wakefulness after sleep onset. See Table 1 legend for expansion of other abbreviation.
a-e
Groups with the same letter(s) represent significant differences as tested by one-way analysis of variance with post hoc analysis with Bonferroni correction.