. Author manuscript; available in PMC: 2018 Jun 11.

Published in final edited form as: Pregnancy Hypertens. 2017 Nov 15;12:144–149. doi: 10.1016/j.preghy.2017.10.005

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	0.75
Nulliparous [n (%)]	48 (62.3%)	35 (55.6%)	0.42
Gestational age at delivery (weeks) [median (min-max)]	33.9 (24.9–39.4)	38.7 (37.1–41.9)	<0.001
Pre-pregnancy BMI (kg/m²) [median (min-max)]	23.7 (18.9–41.1)	22.3 (17.4–30.7)	0.004
Smoked during pregnancy [n (%)]	8 (10.4%)	6 (9.5%)	0.87

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.