Fig. 4

Asthma risk according to total bilirubin levels in CC & CT genotypes and the TT genotype. Multivariate logistic regression analysis was evaluated using rs6432011 data. A and B show the risk of asthma with decreasing total bilirubin levels for each genotype. Bilirubin levels were divided into high and low level groups based on a threshold of − 0.28 mg/dL. The number at the top of the bar represents the odds ratio value for asthma. The significance (P-value) of difference was determined with the Student’s t-test. ns, not significant