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Table 2 Univariate analysis of influential factors of macrosomia in the first and second parturient groups

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

Variables Pregnant women in their first pregnancy (n, %, mean ± SD) Pregnant women in their second pregnancy (n, %, mean ± SD) χ2/t p value
Fetal macrosomia
 Yes 79 (7.2) 36(7.1)   
 No 1015 (92.8) 468 (92.9) 0.003 0.955
Maternal age (years) 29.21±3.51 28.80±3.39 2.207 0.027*
Maternal height (m) 1.61±0.05 1.61±0.05 1.362 0.174
Delivery weight (kg) 60.68±8.72 62.12±8.38 − 3.109 0.002**
Maternal BMI (kg/m2) 23.31±3.21 23.98±3.08 − 3.871 0.000***
Gestational diabetes mellitus
 Yes 39 (3.6) 18 (3.6)   
 No 1055 (96.4) 486 (96.4) 0.000 0.995
Gestational hypertension
 Yes 39 (3.6) 33 (6.5)   
 No 1055 (96.4) 471 (93.5) 7.134 0.008
Physical activity time (daily)
 < 30 min 873 (79.8) 409 (81.2)   
 ≥ 30 min 221 (20.2) 95 (18.8) 0.397 0.528
Fetal birth weight (g) 3334.63±620.82 3448.73±758.73 − 3.174 0.002**
Fetal gender
 Male 587 (53.7) 268 (53.2)   
 Female 507 (46.3) 236 (46.8) 0.032 0.858
  1. *p < 0.05; **p < 0.01;***p < 0.0001. SD standard deviation, BMI body mass index
  2. Maternal BMI refers to the last weight recorded before delivery