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Comparison of sleep stages in respondents with any medical disorders compared with respondents with no medical disorders
| Sleep stage | Respondents with any medical disorder (n = 341) (mean ± SE) | Respondents with no medical disorders (n = 242) (mean ± SE) | P |
|---|---|---|---|
| Stage N1 (%) | 10.9 ± 0.4 | 9.9 ± 0.4 | 0.13 |
| Stage N2 (%) | 56.7 ± 0.5 | 58.7 ± 2.0 | 0.34 |
| Stage N3 (%) | 14.6 ± 0.5 | 14.5 ± 0.6 | 0.95 |
| Stage REM (%) | 17.6 ± 0.3 | 19.0 ± 0.4 | 0.02 |
