Associations between inflammatory bowel disease, medication use during pregnancy and rates of preterm delivery (PTD) subtypes in the Danish National Birth Cohort, 1996–2003. A. BoydHeather BasitSaima C. HarpsøeMaria WohlfahrtJan JessTine 2015 <p>HR, hazard ratio; CI, confidence interval; PTD, preterm delivery; PPROM, premature preterm rupture of membranes.</p><p>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 <10 employees; skilled worker (completed vocational training with apprenticeship) and currently employed; unskilled worker or unemployed (short-term); current student; unemployed (long-term)), pre-pregnancy BMI (<20, 20–25, >25), and smoking (non-smoker, smoker) and alcohol consumption (non-drinker, <1 drink/week, ≥1 drink/week) during pregnancy, in strata within the models.</p><p><sup>a</sup> Includes women with IBD who used internal corticosteroids or 5-ASA during pregnancy.</p><p>Associations between inflammatory bowel disease, medication use during pregnancy and rates of preterm delivery (PTD) subtypes in the Danish National Birth Cohort, 1996–2003.</p>