Associations between moderate/severe asthma according to the Firoozi index the year before pregnancy and perinatal outcomes in a cohort of 284 214 pregnancies, mild asthma as reference.

Unadjusted and adjusted model (n = 249 006) estimated by multinomial logistic regression with OR and 95% CI. In unadjusted analyses n = 8962 were included in the mild asthma group and n = 4072 in the moderate/severe group. In the adjusted analyses n = 7996 were included in the mild and n = 3646 in the moderate/severe group.*Adjusted for age, BMI, parity, smoking at antenatal care admission, country of birth, cohabitation/marital status and level of education.