Objective To investigate the ability of upper airway measurement to predict the severity of obstructive sleep apnea hypopnea syndrome( OSAHS) in different genders. Methods This study included 163 OSAHS patients( 98 men and 65 women) diagnosed by polysomnography. Computed tomography( CT) scans of the upper airway during quiet breathing were performed. Parameters including the vertical distance from the inferior margin of the hyoid to the inferior mandibular margin( submental point)( D-HM) and from the forefr...