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Background Obstructive sleep apnea hypopnea syndrome(OSAHS) is underdiagnosed.Screening patients at high risk of OSAHS is extremely important.Using standard questionnaire to screen OSAHS is a practical method.The study was to evaluate the value of the STOP-Bang questionnaire in screening OSAHS in sleep disordered breathing clinic by comparing with the Epworth sleepiness scales, Berlin questionnaire and STOP questionnaire.