TABLE 2

Correlation between optimal continuous positive airway pressure and baseline variables

Variable	Whole group (n=198)		Non-DS (n=175)		DS (n=23)
Variable	Spearman's Rho	p-value	Spearman's Rho	p-value	Spearman's Rho	p-value
Age	0.216	0.002	0.149	0.049	0.544	0.007
OAHI	0.421	<0.001	0.436	<0.001	0.341	0.111
ODI₃	0.417	<0.001	0.414	<0.001	0.502	0.040
REM RDI	0.378	<0.001	0.406	<0.001	0.267	0.243
SpO₂ nadir	−0.333	<0.001	−0.359	<0.001	−0.074	0.739
BMI z-score	0.160	0.024	0.263	<0.001	0.251	0.249
Previous AT	0.065	0.454	0.171	0.067	0.319	0.212
No previous AT	0.301	0.015	0.379	0.003	0.213	0.686
Male	0.213	0.011	0.324	<0.001	0.350	0.219
Female	0.003	0.981	0.069	0.643	0.087	0.824

DS: Down syndrome; OAHI: obstructive apnoea–hypopnoea index; ODI₃: 3% oxygen desaturation index; REM: rapid eye movement; RDI: respiratory disturbance index; SpO₂: arterial oxygen saturation measured by pulse oximetry; BMI: body mass index; AT: adenotonsillectomy.