Fig. 1From: Bidirectional association between asthma and otitis media in childrenA schematic illustration of the participant selection process used in the present study. a Of a total of 1,125,691 participants, 14,665 asthma patients were matched with 14,665 control I participants for age, group, sex, income group, and region of residence. b Of a total of 1,125,691 participants, 27,043 otitis media patients were matched with 27,043 control II participants for age, group, sex, income group, and region of residenceBack to article page