Table 7

Multivariable negative binomial regression model for hospital admission (n=1000)

Univariable analysesMultivariable analysis
IRR95% CIP valueaIRR95% CIP value
Anti-TNF-α monotherapy1.670.92 to 3.060.101.660.91 to 3.040.10
Thiopurine monotherapy1.400.88 to 2.220.151.350.85 to 2.150.20
Anti-TNF-α and thiopurine1.630.71 to 3.780.251.650.71 to 3.820.24
Systemic corticosteroids1.550.97 to 2.500.071.520.94 to 2.440.09
Smoking during pregnancy1.520.70 to 3.320.29
Disease activity1.270.81 to 1.980.30
Obstetric complications0.920.49 to 1.740.80
Preterm birth1.170.66 to 2.050.60
Day care attendance1.140.60 to 2.150.69
Breast feeding (>1 month)0.950.64 to 1.400.79
  • aIRR, adjusted incidence rate ratio; IRR, incidence rate ratio ; TNF, tumour necrosis factor.