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Table 1 Maternal and infant characteristics, of women exposed and non-exposed to SHS

From: The independent effects of second hand smoke exposure and maternal body mass index on the anthropometric measurements of the newborn

Variable Women non-exposed to SHS (N = 2433) Women exposed to SHS (N = 798) P value
Maternal characteristics    
Maternal age (year) 29.53 ± 6.2 28.86 ± 6.1 0.008
Parity 3.01 ± 2.2 2.78 ± 2.1 0.008*
Primipara 795 (31.8%) 344 (41.4%) < 0.001
Gestation age at booking (week) 21.8 ± 8.8 22.2 ± 5.3 0.34
BMI (kg/m2) 29.45 ± 5.96 29.7 ± 6.04 0.23
GDM 354 (14.5%) 114 (14.3%) 0.85
Pre-existing diabetes:    
 Type I 9 (0.37%) 6 (0.75%) 0.20
 Type II 7 (0.28%) 5 (0.72%) 0 .20
Pregnancy induced hypertension 29 (1.2%) 11 (1.4%) 0.68
Preeclampsia 17 (0.7%) 5 (0.62%) 0.83
Infant characteristics    
Male, n (%) 1303 (53.6%) 412 (51.7%) 0.36
Gestational age (week) 39.12 ± 1.19 39.12 ± 1.195 0.85
Birth weight (kg) 3.2 ± 0.45 3.15 ± 0.46 0.012*
Birth length (cm) 49.89 ± 2.16 49.69 ± 2.27 0.029
Head circumference (cm) 34.26 ± 1.25 34.13 ± 1.21 0.011
Macrosomia (≥ 4.0 kg) 113 (4.64%) 30 (3.75%) 0.29
Low birth weight (<2.5 kg) 111 (4.56%) 41 (5.14%) 0.5
  1. Mann–Whitney Test*.
  2. Data expressed as either n (%) or mean ± standard deviation.
  3. SHS = second-hand smoke, BMI = body mass index, GDM = gestational diabetes.
  4. Bold figure indicates statistical significance.