Logistic regression analyses of the adjusted associations between betel chewing and asthma.

1Logistic regression adjusted for age, gender, BMI and smoking.2Logistic regression adjusted for age, gender, BMI, smoking and log eotaxin-1 levels (345 cases and 389 controls were randomly selected to measure eotaxin-1 levels).3The mediation effect of eotaxin-1 was 50.5% of the total effect of betel chewing on asthma being mediated through this pathway.