IL4R and atopic asthma: In the subgroup analysis according to atopic status, the IL4RA I50 V polymorphism was not significantly associated with the risk of atopic asthma (OR = 1.19, 95% CI 1.01–1.40, P = 0.04) or non-atopic asthma risk (OR = 0.92, 95% CI 0.63–1.35, P = 0.67).