Comparison of characteristics of subjects with and without obstructive sleep apnoea (OSA)
Non-OSA | OSA | p-value | |
Subjects | 131 | 60 | |
Male/female | 44/87 | 24/36 | 0.4# |
Age years | 12 (6–18) | 11 (5–17) | 0.1¶ |
Height m | 1.55 (1.14–1.83) | 1.51 (1.07–1.86) | 0.1¶ |
Weight kg | 71.0 (30.4–129.8) | 67.3 (28.0–137.0) | 0.3¶ |
BMI z-score | 2.5 (1.5–3.5) | 2.5 (1.7–4.1) | 0.6¶ |
Waist circumference cm | 92.4±13.6 | 93.2±17.1 | 0.7+ |
WHR | 0.89 (0.75–1.02) | 0.92 (0.79–1.04) | <0.001¶ |
Fat mass % | 36.9 (25.7–60.4) | 36.1 (27.3–53.1) | 0.9¶ |
TST min | 512 (169–637) | 512 (293–648) | 0.6¶ |
oAHI events·h−1 | 0.5 (0.0–1.9) | 4.9 (2.0–67.3) | <0.001¶ |
RDI events·h−1 | 0.85 (0.00–4.80) | 5.90 (2.00–67.70) | <0.001¶ |
Mean SpO2 % | 97.2 (91.2–98.2) | 96.7 (91.9–98.6) | 0.001¶ |
SpO2 nadir % | 93 (80–100) | 91 (81–100) | <0.001¶ |
TST95 % | 99.7 (25.6–100.0) | 98.0 (2.4–100.0) | <0.001¶ |
ODI events·h−1 | 0.3 (0.0–8.4) | 0.8 (0.0–33.8) | <0.001¶ |
N1 %TST | 2 (0–13) | 2 (0–16) | 0.6 |
N2 %TST | 51 (28–72) | 45 (8–65) | <0.001 |
N3 %TST | 22 (4–48) | 28 (8–65) | <0.001 |
REM %TST | 23 (0–36) | 23 (5–37) | 0.7 |
Data are presented as n, mean±sd or median (range), unless otherwise stated. BMI: body mass index; WHR: waist-to-hip ratio; TST: total sleep time; oAHI: obstructive apnoea–hypopnoea index; RDI: respiratory disturbance index; SpO2: arterial oxygen saturation measured by pulse oximetry; TST95: TST with SpO2 >95%; ODI: oxygen desaturation index; N1–N3: sleep stages; REM; rapid eye movement. #: Chi-squared test; ¶: Mann–Whitney U-test; +: independent sample t-test. p≤0.05 was considered statistically significant.