Table 1.
Comparative data between baseline polysomnography and HOBE polysomnography
| Baseline | Head-of-bed elevation | p | |
|---|---|---|---|
| TST (min) | 359 ± 50 | 365 ± 34 | 0.446 |
| Sleep efficiency (%) | 87.2 [76.7–90.7] | 88.8 [81.6–93.3] | 0.005 |
| N1 (%) | 6.0 ± 3.2 | 5.8 ± 2.5 | 0.678 |
| N2 (%) | 61.9 ± 12.5 | 60.2 ± 10.9 | 0.198 |
| N3 (%) | 20.7 ± 12.2 | 21.2 ± 10.1 | 0.680 |
| REM (%) | 11.3 ± 5.6 | 12.8 ± 6.4 | 0.076 |
| ArI (events/h) | 9.1 [5.5–17.7] | 8.1 [6.4–12.4] | 0.682 |
| Time in supine position (min) | 97.8 ± 98.9 | 107.1 ± 95.6 | 0.488 |
| AHI (events/h) | 15.7 [11.3–22.5] | 10.7 [6.6–16.5] | <0.001 |
| AHI supine (events/h) | 20.5 [10.0–33.2] | 11.3 [8.5–22.6] | 0.023 |
| AHI non-supine (events/h) | 12.3 [6.1–27.2] | 8.1 [4.4–12.4] | <0.001 |
| CAI (events/h) | 0 [0–0.3] | 0 [0–0.2] | 0.321 |
| OAI (events/h) | 2.2 [0.9–4.7] | 2.1 [0.6–4.4] | 0.461 |
| MAI (events/h) | 0.2 [0–0.6] | 0.2 [0–0.5] | 0.257 |
| HI (events/h) | 12.9 [8.6–15.4] | 6.8 [3.7–11.3] | <0.001 |
| SatO2 min (%) | 83.5 [77.5–87] | 87 [81–90] | 0.003 |
Results are shown as median [IQR] or mean ± SD
All the p < 0.05 in bold
AHI apnea-hypopnea index, CAI central apnea index, OAI obstructive apnea index, MAI mixed apnea index, HI hypopnea index, SatO 2 min minimum oxygen saturation, TST total sleep time, N1 non-REM sleep stage 1, N2 non-REM sleep stage 2, N3 non-REM sleep stage 3, REM rapid eye movement, ArI arousal index