TABLE 2

Association between maternal body mass index and number of wheezing days in the offspring

ModelSubjects nComplete casesImputed data
IRR (95% CI)p-valueIRR (95% CI)p-value
117621.018 (1.004–1.032)0.011.010 (0.994–1.026)0.22
216751.023 (1.007–1.038)<0.011.008 (0.992–1.025)0.31
316731.028 (1.012–1.044)<0.011.010 (0.994–1.027)0.22
414201.038 (1.021–1.055)<0.011.009 (0.993–1.025)0.27
514201.015 (0.998–1.032)0.090.999 (0.981–1.016)0.87
  • IRR: incidence rate ratio; 1: univariable; 2: daycare, breastfeeding, older siblings, smoke exposure during pregnancy, pet keeping, socioeconomic status, ethnicity and maternal age; 3: all variables of model 2 and birthweight; 4: all variables of model 2 and compliance of the respiratory system; 5: all variables of model 2 and resistance of the respiratory system.