FasL: Fas ligand, OR: odds ratio, 95% CI: 95% confidence interval,
FEV1: forced expiratory volume in the first second, FVC: forced vital capacity
Multivariate logistic regression method: backward stepwise (conditional), Adjusted by gender, mode of delivery, maternal and paternal allergic diseases, smoking during pregnancy and at home, gestational age,
Cord blood sFasL level: every 100-increment