Abstract: Objective  To evaluate oxygen desaturation index (ODI),  StopBang questionnaire and Epworth sleepiness scale (ESS) in screening of the bus drivers with obstructive sleep apnea syndrome (OSA).Methods  A total of 195 cases of bus drivers with snoring between December 2016 and January 2018 (177 males and 18 females) were randomly selected. StopBang questionnaire, ESS, nocturnal oximetry monitoring and the overnight polysomnography （PSG） monitoring were conducted among them. Based on the severity of OSA which was determined by PSG, the participants were classified into four groups: primary snoring (<5 events/h), mild (-15 events/h ), moderate (-30 events/h ), and severe (≥30 events/h ). Sensitivity, specificity, positive predictive value, negative predictive and the receiver operating characteristics curve of three detection methods were calculated. Results  Using mildmoderatesevere (≥5 events/h), moderatesevere (≥15 events/h), and severe (≥30 events/h) OSA as cutoffs, StopBang questionnaire had the highest sensitivity; ODI had the largest area under the receiver operating characteristics curve, while ESS had the lowest sensitivity. Application of StopBang questionnaire, combined with ODI, boasts the highest diagnostic accuracy.ConclusionCombination of StopBang questionnaire with ODI has great value to assess OSA in bus drivers.

Key words: sleep apnea, , obstructive, oxygen desaturation index, polysomnography