Table. Baseline Characteristics of the Offspring According to Prenatal Exposure to Maternal Autoimmune Diseases.
| Characteristics | Maternal autoimmune disease, No. (%) | |
|---|---|---|
| Exposed offspring (n = 50 863) | Unexposed offspring (n = 2 203 371) | |
| Sex | ||
| Female | 24 997 (49.15) | 1 072 255 (48.66) |
| Male | 25 863 (50.85) | 1 130 119 (51.29) |
| Missing | 3 (0.01) | 997 (0.05) |
| Calendar year of birth | ||
| 1978-1985 | 3187 (6.27) | 424 492 (19.27) |
| 1986-1994 | 6232 (12.25) | 538 798 (24.45) |
| 1995-2005 | 16 391 (32.23) | 679 775 (30.85) |
| 2006-2016 | 25 053 (49.26) | 560 306 (25.43) |
| Gestational age at birth, wk | ||
| <37 | 5161 (10.15) | 94 899 (4.31) |
| ≥37 | 44 991 (88.46) | 2 028 343 (92.06) |
| Missing | 711 (1.40) | 80 129 (3.64) |
| Maternal parity | ||
| 1 | 21 193 (41.67) | 986 635 (44.78) |
| 2 | 19 583 (38.50) | 818 434 (37.14) |
| ≥3 | 10 087 (19.83) | 398 302 (18.08) |
| Maternal age at childbirth, y | ||
| <20 | 332 (0.65) | 39 822 (1.81) |
| 20-34 | 38 590 (75.87) | 1 839 428 (83.48) |
| ≥35 | 11 941 (23.48) | 324 121 (14.71) |
| Maternal educational level at childbirth, y | ||
| 0-9 | 10 902 (21.43) | 595 282 (27.02) |
| 10-14 | 22 309 (43.86) | 951 005 (43.16) |
| ≥15 | 17 136 (33.69) | 613 715 (27.85) |
| Missing | 516 (1.01) | 43 369 (1.97) |
| Maternal cohabitation at childbirth | ||
| Yes | 27 003 (53.09) | 1 214 548 (55.12) |
| No | 23 851 (46.89) | 986 215 (44.76) |
| Missing | 9 (0.02) | 2608 (0.12) |
| Maternal residence at childbirth | ||
| Copenhagen | 6219 (12.23) | 244 865 (11.11) |
| City with ≥100 000 inhabitants | 7110 (13.98) | 280 727 (12.74) |
| Other | 37 534 (73.79) | 1 677 779 (76.15) |
| Maternal country of birth | ||
| Denmark | 46 124 (90.68) | 1 955 104 (88.73) |
| Other | 4712 (9.26) | 243 512 (11.05) |
| Missing | 27 (0.05) | 4755 (0.22) |