Table 2.
Demographic and clinical characteristics for Norwegian cohort.
| Characteristic | Cases (n = 77) | Controls (n = 63) | p |
|---|---|---|---|
| Maternal age at delivery, years [mean ± SD] | 31.8 ± 4.7 | 32.0 ± 4.6 | .75 |
| Nulliparous [n (%)] | 48 (62.3%) | 35 (55.6%) | .42 |
| Gestational age at delivery (weeks) [median (min-max)] | 33.9 (24.9–39.4) | 38.7 (37.1–41.9) | <.001 |
| Pre-pregnancy BMI (kg/m2) [median (min-max)] | 23.7 (18.9–41.1) | 22.3 (17.4–30.7) | .004 |
| Smoked during pregnancy [n (%)] | 8 (10.4%) | 6 (9.5%) | .87 |
Abbreviations: BMI (kg/m2), body mass index (kilograms/meters squared). Notes: Pre-pregnancy BMI includes BMI pre-pregnancy or within the first trimester of pregnancy.