Associations between inflammatory bowel disease, medication use during pregnancy and rates of preterm delivery (PTD) subtypes in the Danish National Birth Cohort, 1996–2003.

HR, hazard ratio; CI, confidence interval; PTD, preterm delivery; PPROM, premature preterm rupture of membranes.All estimates were adjusted for parity (0, 1, ≥2), socioeconomic status (6 categories: master’s degree or higher and currently employed, or leader of a business with ≥10 employees; bachelor’s degree and currently employed, or leader of a business with 25), and smoking (non-smoker, smoker) and alcohol consumption (non-drinker, a Includes women with IBD who used internal corticosteroids or 5-ASA during pregnancy.Associations between inflammatory bowel disease, medication use during pregnancy and rates of preterm delivery (PTD) subtypes in the Danish National Birth Cohort, 1996–2003.