MBL2 and asthma: There was no interaction between 5T/7T genotype and smoking status (P = 0.78), occupational exposure to dust or welding fumes (P = 0.10), familial asthma (P = 0.37), α1-antitrypsin MS genotype (P = 0.64), α1-antitrypsin MZ genotype (P = 0.47), or mannose-binding lectin deficiency (P = 0.73) in predicting FEV1 % predicted at study entry.