Table 1.
PSG variables
| Young adults (n = 30) | Older adults (n = 33) | Age effect (p-value) | |
|---|---|---|---|
| Sleep duration (min) | 451.3 (6.6) | 397.2 (8.7) | p < 0.001 |
| Sleep efficiency (%) | 93.11 (5.6) | 83.9 (9.7) | p < 0.001 |
| N1 (min) | 33.78 (16.5) | 42.72 (19.0) | p = 0.05 |
| N2 (min) | 239.1 (34.0) | 239.0 (38.1) | NS |
| N3 (min) | 84.6 (25.7) | 40.2 (30.1) | p < 0.001 |
| REM (min) | 93.8 (26.3) | 75.3 (24.5) | p = 0.005 |
| N3 (%) | 18.8 (5.9) | 10.1 (7.5) | p < 0.001 |
Mean values for sleep variables are displayed along with the associated SDs for both age groups. p-values are based on t test corrected for unequal variance between groups.