Table 1. Maternal characteristics for women with normal weight compared to women with BMI 25 or above.
| BMI 18.5–24.9 Live born, n = 95,909 |
BMI 18.5–24.9 Stillborn, n = 158 | p-value | BMI >25 Live born, n = 45,735 |
BMI >25 Stillborn, n = 124 |
p-value | |
|---|---|---|---|---|---|---|
| BMI, median | 21.97 (20.7,23.32) | 22.1 (20.91,23.34) | 0.457 | 27.78 (26.17,30.49) | 28.74 (26.95,32.07) | <0.001 |
| Papp-a, median | 1.04 (0.71,1.5) | 0.96 (0.63,1.5) | 0.113 | 1 (0.68,1.45) | 0.92 (0.66,1.19) | 0.005 |
| Age (years) | 34 (30,36) | 34 (31,37) | 0.268 | 35 (31,37) | 36 (33,38) | 0.008 |
| Smoking status, yes/no, n (%) | 2395 (2.5%) | 6 (3.8%) | 0.429 | 2217 (4.85%) | 12 (9.68%) | 0.022 |
| Born in the nordic countries, n (%) | 79125 (82.5%) | 134 (84.81%) | 0.51 | 35614 (77.87%) | 83 (66.94%) | 0.005 |
| Annual income, skr/year, median | 243875 (177606,318506) | 237834.5 (179927.25,309982.5) | 0.403 | 217789 (155780,278175.5) | 211720.5 (125562,269198.5) | 0.269 |
| Educational level, median | 5 (3,5) | 5 (3,5) | 0.085 | 5 (3,5) | 3.5 (3,5) | 0.087 |
| Mothers living alone, n (%) | 1103 (1.17%) | 3 (1.92%) | 0.615 | 838 (1.86%) | 3 (2.54%) | 0.838 |
| Drug abuse, n (%) | 346 (0.36%) | 0 (0%) | 0.927 | 271 (0.59%) | 1 (0.81%) | 1 |
| Nulliparous,n (%) | 42291 (44.09%) | 76 (48.1%) | 0.351 | 16873 (36.89%) | 58 (46.77%) | 0.029 |
| Previous SGA, n (%) | 1193 (1.24%) | 2 (1.27%) | 1 | 671 (1.47%) | 2 (1.61%) | 1 |
| Previous stillbirth, n (%) | 150 (0.16%) | 1 (0.63%) | 0.613 | 161 (0.35%) | 0 (0%) | 1 |
| Previous Pre-eclampsia, n (%) | 1270 (1.32%) | 2 (1.27%) | 1 | 1156 (2.53%) | 2 (1.61%) | 0.718 |
| Gestational age (weeks) | 40 (39,41) | 37 (34,40) | <0.001 | 40 (39,41) | 37 (32,40) | <0.001 |
| Antiphosholipid syndrome, n (%) | 31 (0.03%) | 0 (0%) | 1 | 6 (0.01%) | 0 (0%) | 1 |
| SLE, n (%) | 56 (0.06%) | 0 (0%) | 1 | 28 (0.06%) | 0 (0%) | 1 |
| Pregnancy induced hypertension, n (%) | 1235 (1.29%) | 2 (1.27%) | 1 | 1297 (2.84%) | 2 (1.61%) | 0.583 |
| Essential hypertension, n (%) | 241 (0.25%) | 2 (1.27%) | 0.081 | 456 (1%) | 2 (1.61%) | 0.813 |
| GDM, n (%) | 384 (0.4%) | 1 (0.63%) | 1 | 1031 (2.25%) | 3 (2.42%) | 1 |
| Early fetal growth, days | 2 (0,4) | 2 (0.5,4) | 0.722 | 2 (0,4) | 2 (0,4) | 0.222 |
| SGA <10th, n (%) | 8488 (8.86%) | 56 (36.6%) | <0.001 | 3180 (6.96%) | 50 (41.67%) | <0.001 |
| Pre-eclampsia, n (%) | 1963 (2.05%) | 4 (2.53%) | 0.882 | 1963 (4.29%) | 14 (11.29%) | <0.001 |