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. 2016 Oct 5;32(2):135–144. doi: 10.1007/s10654-016-0201-3

Table 1.

Descriptive statistics of mother and child pairs

Characteristics Value
hCG, median (95 % range), IU/l, 35559.0 (6106.8–101808.5)
Birth weight, mean (SD), g 3412.0 (559.7)
Gestational age at blood sampling, median (95 % range), weeks 14.4 (10.1–26.2)
Gestational age at birth, mean (SD), weeks 39.8 (1.9)
Age, mean (SD), years 29.6 (5.3)
BMI, median (95 % range), kg/m2 23.9 (18.7–36.5)
Parity, n (%)
Nullipara 4531 (55.3)
Primipara 2475 (30.2)
Multipara 1187 (14.5)
Smoking status, n (%)
Non smokers 5953 (72.7)
Stopped smokers 691 (8.4)
Smokers 1549 (18.9)
Educational level, n (%)
No education or primary education 1046 (12.8)
Secondary education 3844 (46.9)
Higher education 3303 (40.3)
Ethnicity, n (%)
Dutch 3742 (46.6)
Moroccan 530 (6.6)
Turkish 710 (8.8)
Surinam 686 (8.5)
Other-European 598 (7.5)
Other-Non-European 1758 (21.9)
Fetal sex, n (%)
Male 4124 (50.3)
Female 4069 (49.7)
Gestational weight gain, mean (sd), kg 10.0 (5.1)
Placental weight at birth (g), median, (95 % range) 620.0 (390.0–950.0)