Fig. 1

Hazard ratios and 95% confidence intervals for postpartum psychiatric disorders within 90 days after childbirth according to clinical rheumatoid arthritis (rheumatoid arthritis diagnosed before childbirth) and preclinical rheumatoid arthritis (rheumatoid arthritis diagnosed after childbirth). Abbreviations: HRs, hazard ratios; CI, confidence interval; PPD, postpartum psychiatric disorders; RA, rheumatoid arthritis. Adjusted for maternal age at delivery, calendar year of childbirth, parity, maternal highest education levels at delivery, and maternal marital status at delivery. The reference group consists of births by women who unexposed to clinical RA and preclinical RA