IGF1 and obstructive sleep apnea syndrome: Therefore, we conducted a subgroup analysis according to BMI and found that serum IGF-1 concentrations in patients with OSAHS and a mean BMI ≥ 30 and< 30 were lower than those of subjects in the control group, although the decreased serum IGF-1 levels in patients with OSAHS and a mean BMI≥30 were more prominent.