Pre- and postoperative patient characteristics and PSG outcome data
| Variable | Preoperative value | Postoperative value | p Value |
|---|---|---|---|
| Age (years) | 4.0 (2.7–5.8) | 4.7 (3.1–6.5) | 0.001* |
| BMI z-score | 0.8 (−0.5–1.8) | 0.9 (0.3–1.4) | 0.332 |
| oAHI (/hour) | 11.4 (6.5–22.7) | 3.6 (2.1–9.5) | 0.001* |
| MeanSatO2 (%) | 96.3 (95.0–96.9) | 96.6 (95.2–97.2) | 0.254 |
| MinSatO2 (%) | 84.0 (79.5–89.0) | 88.5 (84.0–90.1) | 0.008* |
| ODI (n/hour) | 5.6 (1.8–12.6) | 2.9 (1.1–5.8) | 0.093 |
| Sleep efficiency (%) | 86.0 (78.5–91.4) | 88.8 (82.9–92.1) | 0.207 |
| Arousal index (n) | 9.5 (0.6–20.2) | 8.6 (1.5–14.9) | 0.143 |
| Stage 1 (% TST) | 1.6 (1.0–3.0) | 2.0 (1.0–4.1) | 0.567 |
| Stage 2 (% TST) | 44.4 (33.7–49.0) | 45.7 (37.0–48.9) | 0.654 |
| Stage 3 (% TST) | 24.1 (17.3–29.5) | 20.7 (17.7–25.5) | 0.304 |
| REM sleep (% TST) | 25.6 (20.2–32.4) | 27.7 (23.0–32.0) | 0.194 |
*p<0.05.
BMI, body mass index; MeanSatO2, mean oxygen saturation; MinSatO2, minimum oxygen saturation; oAHI, obstructive apnoea-hypopnoea index; ODI, oxygen desaturation index; PSG, polysomnography; REM, rapid eye movement; TST, total sleep time.