Mean (SD) sleep architecture and respiratory variables at overnight polysomnography in the relatives and control subjects
| Relatives | Controls | p value | |
|---|---|---|---|
| Stage 1 (% TST) | 10.7 (7.2) | 6.4 (4.1) | 0.01 |
| Stage 2 (% TST) | 47.6 (11.1) | 48.6 (7.9) | 0.8 |
| Slow wave sleep (% TST) | 21.5 (9.6) | 21.6 (7.3) | 1.0 |
| REM (% TST) | 20.3 (7.0) | 23.4 (6.9) | 0.2 |
| Sleep efficiency (TST/TRT) | 79.3 (18.9) | 86.1 (7.5) | 0.2 |
| Apnoea/hypopnoea index (AHI) | 3.8 (5.1) | 2.9 (1.9) | 0.5 |
| Mean oxygen saturation non-REM sleep (%) | 95 (1) | 95 (1) | 0.1 |
| Minimum oxygen saturation non-REM sleep (%) | 90 (3) | 90 (3) | 0.9 |
| Mean oxygen saturation REM sleep (%) | 95 (2) | 96 (2) | 0.8 |
| Minimum oxygen saturation REM sleep (%) | 88 (4) | 89 (2) | 0.1 |
TRT = total recorded time; TST = total sleep time.