Table 1.
Characteristics of women with and without systemic lupus erythematosus (SLE) with deliveries in Washington state, 1987 – 2013, and their singleton infants
| Women with SLE (N=1,297) | Women without SLE (N=5,584) | |||
|
| ||||
| Maternal Characteristic at delivery | N | %* | N | %* |
|
| ||||
| Age (years) | ||||
| <20 | 34 | 2.6 | 503 | 9.0 |
| 20–29 | 588 | 45.3 | 2,894 | 51.8 |
| 30–34 | 418 | 32.2 | 1,389 | 24.9 |
| 35–39 | 209 | 16.1 | 651 | 11.7 |
| 40+ | 48 | 3.7 | 147 | 2.6 |
| Race | ||||
| White | 890 | 68.6 | 4,009 | 73.5 |
| Black | 74 | 5.7 | 221 | 4.1 |
| Asian/Pacific Islander | 156 | 12.0 | 482 | 8.8 |
| Hispanic | 94 | 7.2 | 606 | 11.1 |
| Native American | 53 | 4.1 | 13 | 2.5 |
| Body Mass Indexa | ||||
| <18.5 | 26 | 4.0 | 98 | 3.5 |
| 18.5–24.9 | 312 | 47.8 | 1,284 | 46.2 |
| 25–29.9 | 151 | 23.1 | 741 | 26.7 |
| >=30 | 164 | 25.1 | 657 | 23.6 |
| Diabetes | ||||
| No | 1,164 | 89,7 | 2,809 | 93.5 |
| Yes | 70 | 5.7 | 194 | 6.5 |
| Nephritis, nephropathy, or renal failure complicating delivery | 88 | 6.8 | 0 | 0 |
| Education Level | ||||
| Less Than High School | 102 | 7.9 | 901 | 18.5 |
| Graduated High School | 262 | 20.2 | 1,316 | 27.0 |
| College | 635 | 49.0 | 2,197 | 45.0 |
| Graduate School | 152 | 11.7 | 470 | 9.6 |
| Marital Status | ||||
| Unmarried | 338 | 26.1 | 1,705 | 30.6 |
| Married | 957 | 73.8 | 3,866 | 69.4 |
| Smoking During Pregnancy | ||||
| No | 1,125 | 86.7 | 4,760 | 87.3 |
| Yes | 135 | 10.4 | 695 | 12.7 |
| Group B Strep culture positivea | ||||
| No | 584 | 80.8 | 2,453 | 81.7 |
| Yes | 126 | 17.4 | 550 | 18.3 |
| C-Section | ||||
| No | 813 | 62.7 | 4,263 | 76.4 |
| Yes | 484 | 37.3 | 1,319 | 23.6 |
| Number of prior births | ||||
| 0 | 539 | 41.6 | 2,278 | 41.5 |
| 1 | 406 | 31.3 | 1,763 | 32.1 |
| 2+ | 326 | 27.9 | 1,447 | 26.4 |
|
| ||||
| Infant characteristics | Infants Born to Women with SLE N= 1,274 | Infants Born to Women without SLE N= 5,553 | ||
|
| ||||
| N | %* | N | %* | |
|
| ||||
| Infant Breastfed during Birth Hospitalizationa | ||||
| No | 96 | 13.3 | 228 | 7.9 |
| Yes | 579 | 80.3 | 2,676 | 92.2 |
| Birthweight (grams) | ||||
| <1500 | 58 | 4.6 | 44 | 0.8 |
| 1500–2499 | 214 | 16.8 | 194 | 3.5 |
| 2500–3999 | 935 | 73.4 | 4,625 | 83.5 |
| ≥4000 | 60 | 4.7 | 673 | 12.2 |
| Gestational Age at Birth (weeks) | ||||
| <28 | 19 | 1.5 | 7 | 0.1 |
| 28– <32 | 35 | 2.8 | 40 | 0.7 |
| 32– <37 | 240 | 18.8 | 294 | 5.3 |
| 37– <42 | 928 | 72.8 | 4,884 | 91.9 |
| >= 42 | 5 | 0.4 | 92 | 1.7 |
a
BMI, Group B Strep, and infant breastfeeding data available from 2003–2013 only; mothers with SLE: n= 723; mothers without SLE: n= 3,060 (except infant breastfeeding; infants of SLE mothers: n= 721, infants of mothers without SLE: n= 3,038).
*
Missing data not shown, but percent of total N or total as per footnote a.