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Table 1 Maternal, placental, and fetal characteristics grouped by FT-LBW and FT-NBW

From: Placental surface area mediates the association between FGFR2 methylation in placenta and full-term low birth weight in girls

  FT-LBW (N = 86) FT-NBW (N = 79) P value
Mothers
 Age (year), mean (SD) 27.49 (5.88) 28.87 (4.28) 0.08
 Pre-pregnancy BMI, mean (SD) 19.60 (2.66) 19.90 (2.20) 0.43
 College or above, N (%) 27 (31.40) 40 (50.63) 0.03
 Family income ≤ ¥3000/month, N (%) 57 (66.28) 34 (43.04) 0.003
 Married, N (%) 84 (97.67) 76 (96.20) 0.67
 Environmental tobacco smoke, N (%) 31 (36.05) 17 (21.52) 0.03
 Primiparity, N (%) 64 (74.42) 56 (70.89) 0.51
 Alcohol use, N (%) 5 (5.81) 2 (2.53) 0.45
Placenta
 Weight (g), mean (SD) 466.24 (54.58) 504.80 (56.07) < 0.0001
 Major axis length (cm), mean (SD) 18.60 (2.19) 19.86 (1.54) < 0.0001
 Minor axis length (cm), mean (SD) 17.24 (2.11) 18.90 (1.79) < 0.0001
 Area (cm2), mean (SD) 254.81 (60.72) 296.58 (48.07) < 0.0001
 Thickness (cm), mean (SD) 2.50 (1.86) 2.81 (3.42) 0.47
Newborns
 Female, N (%) 52 (60.47) 45 (56.96) 0.75
 Gestational weeks (w), mean (SD) 38.02 (0.97) 38.04 (0.97) 0.92
 Birth weight (g), mean (SD) 2317.27 (136.27) 3122.41 (349.60) < 0.0001
 Length (cm), mean (SD) 47.01 (1.48) 49.27 (1.42) < 0.0001
 Head circumference (cm), mean (SD) 31.36 (1.33) 33.48 (1.20) < 0.0001