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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