- Eligible participants with non-treated OSA syndrome were aged between 18 to 65 years, with a body-mass index (BMI) ≥ 30 kg/m2 or ≥ 27 kg/m2 in the presence of other risk factors such as controlled systemic hypertension, type 2 diabetes, dyslipidemia and/or visceral obesity (as defined by a waist circumference ≥ 102 cm in men and ≥ 88 cm in women).