TABLE 2.
Traditional PSG measures
| Did not develop MCI/dementia (n = 85) | Developed MCI/dementia (n = 85) | p-value | |
|---|---|---|---|
| Total sleep time (min) | 348.7 (72.4) | 354.5 (74.9) | .61 |
| WASO (min) | 91.1 (59.1) | 107.3 (66.0) | .09 |
| Sleep efficiency (%) | 75.3 (12.0) | 74.3 (13.3) | .62 |
| AHI (hypopneas with 3% desat) | 14.2 (13.8) | 14.3 (13.2) | .74 |
| AHI (hypopneas with 4% desat) | 8.6 (10.6) | 8.9 (10.6) | .51 |
| Percent sleep time SaO2 < 90% | 3.5 (6.8) | 3.2 (7.5) | .45 |
| Arousal index per hour of sleep | 20.5 (11.1) | 19.3 (10.4) | .45 |
| Time in stage 1 (%) | 5.3 (3.3) | 4.9 (2.7) | .42 |
| Time in stage 2 (%) | 55.6 (9.8) | 55.1 (13.5) | .76 |
| Time in stage ¾ (%) | 19.9 (9.8) | 22.0 (12.8) | .23 |
| Time in REM (%) | 19.2 (6.7) | 18.0 (7.7) | .29 |
| PLMS per hour of sleep | 26.6 (28.3) | 33.4 (35.7) | .21 |
| PLMS w/arousals per hour of sleep | 3.7 (6.8) | 4.1 (5.2) | .13 |
M ± SD.
AHI, apnea-hypopnea index; MCI, mild cognitive impairment; PLMS, periodic limb movements of sleep; REM, rapid eye movement; WASO, wake after sleep onset.