Summary statistics for symptoms of sleep-disordered breathing, tonsillar and adenoidal size, and polysomnography indices in the three study groups
| Controls | Snoring and AHI <5 episodes·h−1 | Snoring and AHI ≥5 episodes·h−1 | |
| Subjects n | 23 | 61 | 30 |
| Snoring >3 nights·week−1 | 0 (0) | 61 (100) | 30 (100) |
| Apnoea >3 nights·week−1 | 0 (0) | 15 (25) | 18 (60) |
| Difficulty breathing >3 nights·week−1 | 0 (0) | 22 (36) | 21 (70) |
| Mouth-breathing during day or night | 0 (0) | 56 (92) | 28 (93) |
| Tonsillar size | |||
| 0 | 9 | 1 | 0 |
| 1 | 14 | 2 | 0 |
| 2 | 0 | 19 | 7 |
| 3 | 0 | 34 | 19 |
| 4 | 0 | 5 | 4 |
| Adenoidal/nasopharyngeal diameter ratio | 0.68±0.1 | 0.74±0.1 | |
| Apnoea index episodes·h−1 | 0.5 (0.3–1.3) | 2.7 (1.8–4.6) | |
| AHI episodes·h−1 | 1.8 (1–3.3) | 8.5 (6.4–14.4) | |
| Respiratory movement/arousal index episodes·h−1 | 0.8 (0.4–1.4) | 3.5 (2.7–4.6) | |
| Oxygen desaturation of haemoglobin# index episodes·h−1 | 1.8 (0.9–2.8) | 8.2 (6.4–13.2) | |
| Sa,O2 nadir % | 90 (88–92) | 85 (81–88) | |
| % sleep time with Sa,O2 <95% | 0.5 (0.2–0.8) | 3.9 (2.3–5.2) |
Data are presented as n, n (%), mean±sd and median (interquartile range). AHI: apnoea-hypopnoea index; Sa,O2: arterial oxygen saturation. #: ≥4%