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hay fever, treatment for hay fever, smoking and alcohol consumption habit, history of drug use for sleeping, existence of snoring, and Japanese version of the Epworth Sleepiness Scale. After excluding responses containing insufficient data, responses from 1,734 patients were considered as eligible. By performing logistic regression analysis, we analyzed the effect of the aforementioned parameters on the comorbidity of EDS and snoring. The odds ratio OR to comorbid EDS was significantly higher in the moderate and severe hay fever groups than in the asymptomatic hay fever group moderate : OR 1.76, p 0.014, severe : OR 2.53, p 0.001. Also, OR to comorbid snoring was significantly higher in the severe hay fever group than in the asymptomatic hay fever group severe : OR 1.90, p 0.001 .