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Background and ObjectiveaaRecent research has found the high prevalence of excessive daytime sleepiness (EDS) among commercial bus drivers which may induce serious physical injury and economic damages. However, there are limited data revealing the risk factors of EDS among these workers. Therefore, we investigated the EDS in commercial bus drivers and its risk factors. MethodsaaSelf-report questionnaires were given to 842 city bus drivers in Suwon, Korea, that included demographic characteristics, the Epworth Sleepiness Scale, Pittsburgh Sleep Quality Index, Insomnia Severity Index, and Berlin Questionnaire. The logistic regression analysis was conducted to investigate the risk factors of EDS among commercial bus drivers. resultsaaThe average of body mass index and total sleep time of 304 responding drivers were 24.7 ± 3.2 kg/m2, 6.05 ± 1.51 hours, respectively. Among them, 13.2% reported an Epworth sleepiness score > 10. The majority of the responders reported suffering from poor sleep quality (68.4%) and 10.2% reported having a moderate to severe insomnia. The proportion of group with high risk for obstructive sleep apnea (OSA) was 26.7%. In multivariate regression analysis, only three variables, including poor quality of sleep, insomnia, and high risk for OSA, were significantly associated with EDS. ConclusionsaaThis study has shown a high prevalence of EDS and insomnia, poor quality of sleep and high risk for OSA as risk factors of EDS among commercial bus drivers in Korea. Sleep Med res 2017;8(2):76-80

Excessive Daytime Sleepiness and Its Risk Factors for Commercial Bus Drivers in Korea