Table 2.
Mean and standard errors of the polysomnographic variables of AD patients, amnesic MCI patients, and HC. The results of the one-way ANOVAs (F and p values) were also reported, with post hoc unpaired t-test (p values) when ANOVAs were significant (p ≤ 0.05). Significant between-groups differences are indicated in bold.
| Variables | AD | MCI | HC | F 2,42 | p | AD versus MCI | AD versus HC | MCI versus HC |
|---|---|---|---|---|---|---|---|---|
| Mean (SE) | Mean (SE) | Mean (SE) | ||||||
| Stage 1 latency (min) | 41.04 (9.78) | 27.44 (4.88) | 19.58 (5.86) | 2.30 | 0.11 | — | — | — |
| Stage 2 latency (min) | 33.27 (8.61) | 26.61 (4.32) | 13.29 (4.58) | 2.73 | 0.08 | — | — | — |
| Stage 1 (%) | 13.33 (3.06) | 9.34 (1.44) | 6.55 (1.33) | 2.63 | 0.08 | — | — | — |
| Stage 2 (%) | 75.92 (3.33) | 76.21 (1.88) | 77.91 (2.10) | 0.18 | 0.83 | — | — | — |
| SWS (%) | 0.08 (0.05) | 0.14 (0.08) | 0.79 (0.34) | 3.73 | 0.03 | 0.53 | 0.05 | 0.07 |
| REM (%) | 10.66 (2.78) | 14.28 (1.85) | 15.22 (1.53) | 1.29 | 0.28 | — | — | — |
| WASO (min) | 92.24 (14.25) | 100.89 (14.06) | 90.37 (8.98) | 0.20 | 0.82 | — | — | — |
| Awakenings (#) | 18.13 (3.87) | 21.33 (2.13) | 20.13 (2.23) | 0.32 | 0.73 | — | — | — |
| Arousals (#) | 40.00 (9.53) | 32.73 (6.53) | 34.40 (7.96) | 0.22 | 0.80 | — | — | — |
| TST (min) | 263.82 (22.46) | 274.31 (16.02) | 303.36 (17.22) | 1.19 | 0.31 | — | — | — |
| TBT (min) | 388.09 (20.91) | 401.47 (9.60) | 406.82 (13.52) | 0.39 | 0.68 | — | — | — |
| SEI% (TST/TBT) | 67.56 (4.15) | 68.31 (3.61) | 74.13 (2.98) | 0.99 | 0.38 | — | — | — |
SWS, slow-wave sleep; REM, rapid eye movement; WASO, waking after sleep onset; TST, total sleep time; TBT, total bed time; SEI, sleep efficiency index.