Main clinical features and pulmonary parameters of subjects included in the study.

Data are mean±SD and median (range). T2DM: type 2 diabetes mellitus; BMI: body mass index; SAHS: sleep apnea-hypopnea syndrome; AHI: apnea-hipoapnea index; CT90: percentage of time spent with oxygen saturations below 90%; SaO2: arterial oxygen saturation; FVC: forced vital capacity; FEV1: forced expiratory volume in 1 second; TLC: total lung capacity; RV: residual volume; PaO2: arterial oxygen pressure; PaCO2: arterial carbon dioxide pressure.*Value expressed as a percentage of the predicted value.