Andersen IG, et al. - The prevalence of obstructive sleep apnea (OSA) in children referred for obesity treatment was assessed vs a normal-weight group, as was the association between Body Mass Index Standard Deviation Score (BMI SDS) and the Apnea–Hypopnea Index (AHI). This cross-sectional study included 139 children aged 7–18 years with overweight/obesity (BMI SDS >1.28) recruited from an obesity treatment clinic and 33 children (BMI SDS ≤ 1.28) aged 7–18 years recruited from schools for the normal-weight group. Children with overweight/obesity had an OSA prevalence of 44.6% vs 9.1% in the normal-weight group, indicating a significantly higher prevalence of OSA among children with overweight/obesity vs normal-weight group. An association of increased BMI SDS with increased AHI was evident.