Abstract:Objective: To analyze the epidemiological characteristics and risk factors of children with bronchial asthma (BA) complicated with recurrent respiratory tract infection (RRTI) in Hebei District, Tianjin City, and to provide reference for the prevention and treatment of children with BA complicated with RRTI. Methods: The stratified cluster sampling method was adopted to randomly select 428 children with BA in Tianjin Province, Hebei Province area as the investigation subjects, and the routine deep sputum culture and etiological examination were performed on them. Among them, the children with RRTI combined were the experimental group (n=84), and the children without RRTI combined were the control group (n=344). The risk factors of BA combined with RRTI were analyzed by logistic regression. The risk factors of BA combined with RRTI were analyzed by self-made investigation. RESULTS: RRTI occurred in 84 of 428 children with BA, the incidence was 19.63%(84/428). The proportion of BA complicated with RRTI from 6 months to 2 years old was higher than that of other age groups (χ2=6.213, P<0.05). There was no significant difference in age and sex between the two groups (P>0.05). The proportion of family smoking, the use of antibiotics more than 3 times a year and the proportion of family allergy history in the experimental group were significantly higher than those in the control group (P<0.05). Logistic regression analysis showed that family smoking, antibiotic use more than 3 times a year and family history of allergy were independent risk factors for BA with RRTI (P<0.05). CONCLUSIONS: The incidence of BA complicated with RRTI in children in Hebei District, Tianjin City is high, and the age of high incidence is 6 months to 2 years old. Among them, the proportion of family smoking, the use of antibiotics three times or more per year, and the proportion of family allergy history are the high risk factors for the occurrence of BA complicated with RRTI in children in Hebei District, Tianjin City.