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Table 3 Univariate analysis of factors that influence macrosomia in second-time pregnant mothers

From: The second pregnancy has no effect in the incidence of macrosomia: a cross-sectional survey in two western Chinese regions

Variables

The second child is fetal macrosomia (n, %, mean ± SD)

The second child is non-fetal macrosomia (n, %, mean ± SD)

χ2/t

p value

The first child is fetal macrosomia

 Yes

2 (5.5)

22 (4.7)

  

 No

34 (94.5)

446 (95.3)

0.000

0.999

Maternal age (years)

27.75±2.39

28.88±3.45

− 2.620

0.012*

Maternal height (m)

161.61±5.00

160.92±4.85

0.819

0.413

Delivery weight (kg)

63.92±8.01

61.99±8.41

1.332

0.184

Maternal BMI (kg/m2)

24.47±2.95

23.94±3.09

1.006

0.315

Gestational diabetes mellitus

 Yes

2 (5.5)

16 (3.4)

  

 No

34 (94.5)

452 (96.6)

0.040

0.842

Gestational hypertension

 Yes

2 (5.5)

20 (4.3)

  

 No

34 (94.5)

448 (95.7)

0.000

0.999

Physical activity time (daily)

 < 30 min

34 (94.5)

376 (80.3)

  

 ≥ 30 min

2 (5.5)

92 (19.7)

4.382

0.036*

Fetal gender

 Male

20 (55.6)

249 (53.2)

  

 Female

16 (44.4)

219 (46.8)

0.074

0.785

  1. *p < 0.05. SD standard deviation, BMI body mass index
  2. Maternal BMI refers to the last weight recorded before delivery