TABLE 1

Comparison of characteristics of subjects with and without obstructive sleep apnoea (OSA)

Non-OSAOSAp-value
Subjects13160
Male/female44/8724/360.4#
Age years12 (6–18)11 (5–17)0.1
Height m1.55 (1.14–1.83)1.51 (1.07–1.86)0.1
Weight kg71.0 (30.4–129.8)67.3 (28.0–137.0)0.3
BMI z-score2.5 (1.5–3.5)2.5 (1.7–4.1)0.6
Waist circumference cm92.4±13.693.2±17.10.7+
WHR0.89 (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 min512 (169–637)512 (293–648)0.6
oAHI events·h−10.5 (0.0–1.9)4.9 (2.0–67.3)<0.001
RDI events·h−10.85 (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−10.3 (0.0–8.4)0.8 (0.0–33.8)<0.001
N1 %TST2 (0–13)2 (0–16)0.6
N2 %TST51 (28–72)45 (8–65)<0.001
N3 %TST22 (4–48)28 (8–65)<0.001
REM %TST23 (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.