TABLE 2.
Polysomnography (PSG) parameters of the insomnia and good sleeping groups (n = 42)
| Measurement | Good sleepers | Insomnia group | Group differences | ||
|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | t | p | p adj | |
| Sleep efficiency, % | 94.55 (4.2) | 88.43 (7.1) | 3.46 | .002 | .012 |
| TIB, hr | 7:57 (0:48) | 8:43 (1:08) | −2.59 | .013 | .052 |
| TST, hr | 7:30 (0:42) | 7:41 (1:08) | −0.66 | .512 | .683 |
| SOL, hr | 0:14:(0:24) | 0:36 (0:32) | −2.46 | .018 | .054 |
| REM latency, hr | 1:26 (0:44) | 1:30 (0:36) | −0.35 | .733 | .733 |
| WASO, hr | 0:27 (0:25) | 1:02 (0:40) | −3.49 | .001 | .012 |
| REM, hr | 1:52 (0:33) | 1:43 (0:33) | 0.83 | .411 | .616 |
| Stage 1, hr | 0:23 (0:14) | 0:21 (0:15) | 0.40 | .695 | .733 |
| Stage 2, hr | 3:42 (0:33) | 3:56 (0:51) | −1.07 | .291 | .499 |
| Stage 3, hr | 0:24 (0:10) | 0:30 (0:09) | −1.79 | .081 | .194 |
| Stage 4, hr | 1:09 (0:21) | 1:11 (0:19) | −0.35 | .726 | .733 |
| Arousal Index | 8.70 (2.20) | 9.87 (4.27) | −1.10 | .258 | .499 |
REM, rapid eye movement sleep; SD, standard deviation; SOL, sleep‐onset latency; TIB, time in bed; TST, total sleep time; WASO, wake after sleep onset.
p values reported here were corrected for multiple testing using the Benjamini and Hochberg correction method (Benjamini & Hochberg, 1995), which controls for false discovery rate, as opposed to the more commonly employed Bonferroni method, which controls for the family‐wise error rate. p values below the significance threshold of .05 are in bold.