Clinical characteristics of patients in the two study groups
| Obstructive sleep apnoea severity (as per Apnoea Hypopnea Index) | No of patients | Mean age (range) | Mean I'm Sleepy Score±SD (range) | Mean Apnoea Hypopnea Index (range) | Minimum saturations (range) | Mean saturations (range) | No with risk factors | |
| Retrospective review | Mild | 57 | 4.7 (2–16 years) | – | 2.5 (1.2–4.9) | 80.5% (73–97) | 97.1% (93–99) | 0 |
| Moderate | 6 | 3.4 (2–6 years) | – | 6.4 (5.1–9.7) | 77.3% (73–81) | 96.3% (92–98) | 0 | |
| Severe | 10 | 4.1 (1–14 years) | – | 23.9 (11.5–64.0) | 68.1% (29–81) | 94.1% (91–97) | 5 | |
| Prospective review | Mild | 20 | 4.9 (2–12 years) | 4.3±1.4 (3-7) | 2.3 (1.0–4.9) | 86.8% (75–93) | 96.7% (94–98) | 4 |
| Moderate | 10 | 5.5 (2–16 years) | 5.3±0.8 (4-6) | 7.6 (5.7–9.8) | 78.6% (52–87) | 95.9% (93–97) | 3 | |
| Severe | 5 | 3.7 (2–6 years) | 4.9±1.1 (3–7) | 16.2 (10.9–23.6) | 76.6% (70–84) | 95.2% (93–97) | 5 |