Proportion of women with RA and women from the general population reporting the events of SA and stillbirths, and characteristics of the women. Values are frequency (%) unless otherwise specified.
| Characteristics | Women with RA, n = 1578 | Reference Women, n = 411,130 | p* |
|---|---|---|---|
| Age at time of last delivery, yrs, mean (SD) | 32.1 (4.8) | 30.9 (5.1) | < 0.001 |
| Parity, mean (SD) | 2.3 (2.1) | 2.1 (2.0) | < 0.001 |
| Early SA, < Week 12 | 413 (26.2) | 88,697 (21.6) | < 0.001 |
| Late SA, weeks 12–22 | 71 (4.5) | 14,539 (3.5) | 0.04 |
| Stillbirth, ≥ Week 22 | 20 (1.3) | 4522 (1.1) | 0.34 |
↵* Student t test or chi-square test. RA: rheumatoid arthritis; SA: spontaneous abortion.