Table 1. Baseline characteristics of 1248 infants born to women with systemic lupus erythematosus (SLE) and 34 886 infants born to general population comparators.
| Infants born to mothers with SLE(n=1248) | Infants born to general population comparators(n=34 886) | |
| Female offspring, n (%) | 640 (51.3) | 16 926 (48.5) |
| Year of birth, n (%) | ||
| 2006–2011 | 370 (29.7) | 15 381 (44.1) |
| 2012–2017 | 400 (32.0) | 10 911 (31.3) |
| 2018–2021 | 478 (38.4) | 8594 (24.6) |
| First birth, n (%) | 558 (44.7) | 14 280 (40.9) |
| Gestational age, mean±SD completed weeks | 38.7 (2.5) | 39.8 (1.8) |
| Term birth, n (%) | 1080 (86.4) | 33 291 (95.4) |
| Preterm birth, n (%) | 168 (13.5) | 1595 (4.6) |
| 32–37 weeks of gestation | 136 (10.9) | 1354 (3.9) |
| <32 weeks of gestation | 32 (2.6) | 241 (0.7) |
| Maternal age at delivery, years, mean±SD | 32.3 (4.6) | 32.0 (5.0) |
| Maternal age at delivery in categories, years, n (%) | ||
| <35 | 882 (70.7) | 25 161 (72.1) |
| ≥35 | 366 (29.3) | 9725 (27.9) |
| Maternal infection during pregnancy, n (%) | 117 (9.4) | 1358 (3.9) |
| Maternal body mass index, mean±SD* | 24.4 (4.3) | 24.9 (4.7) |
| Missing data on body mass index, n (%) | 100 (8.0) | 2223 (6.4) |
| Maternal smoking during the first trimester, n (%)* | 53 (4.2) | 1763 (5.1) |
| Missing data on first-trimester smoking, n (%) | 71 (5.7) | 1767 (5.1) |
*
Mean or percentage excludes missing values.