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Table 1 Demographic characteristics of the study population (n = 206)

From: Placental hypoxia-regulating network in relation to birth weight and ponderal index: the ENVIRONAGE Birth Cohort Study

Characteristics Mean ± SD/Frequency (%)
Boys (n = 96) Girls (n = 110)
Maternal
 Age, years 29.3 ± 4.4 29.5 ± 4.4
 Pre-gestational BMI, kg/m2 24.6 ± 4.6 24.2 ± 5.2
Smoking status
 Never-smoker 64 (66.7) 79 (72.2)
 Past-smoker 16 (16.7) 18 (16.5)
 Current-smoker 16 (16.7) 13 (11.3)
Parity
 1 47 (49.0) 57 (51.8)
 2 37 (38.5) 45 (40.9)
 ≥ 3 12 (12.5) 8 (7.3)
Education
 Low 13 (13.8) 10 (9.2)
 Middle 37 (39.4) 29 (26.6)
 High 44 (46.8) 71 (64.2)
Newborn
 Gestational age, weeks 39.2 ± 1.4 39.3 ± 1.2
 Birth weight, g 3483 ± 483 3385 ± 410
 Ponderal index, kg/m3 × 100 2.63 ± 0.24 2.72 ± 0.24
Ethnicity
 European-Caucasian 85 (88.5) 101 (91.74)
 Non-European 11 (11.5) 9 (8.26)
 C-section 3 (3.1) 3 (2.6)