Associations between maternal asthma and pregnancy characteristics, labour characteristics and perinatal outcomes in a cohort of 284 214 pregnancies, reported as unadjusted and adjusted OR with 95% CI, all estimated by multinomial logistic regression.

In the unadjusted analyses n = 26 586 pregnancies were included in the asthma group. In the adjusted analyses n = 24 203 pregnancies were included in the asthma group.
§Asthma recorded in the Swedish Medical Birth Register, asthma diagnosis in the Swedish National Patient Register and/or asthma medication suspended at least twice according to the Swedish Prescribed Drug Register.
†Adjusted for age, BMI, parity, smoking at antenatal care admission, country of birth, cohabitation/marital status and level of education.
*Significant after having adjusted for multiple hypotheses testing using the Holm-Bonferroni method.