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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.