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Table 1 Characteristics of parent-newborn pairs according to maternal pre-pregnancy BMI

From: Maternal overweight but not paternal overweight before pregnancy is associated with shorter newborn telomere length: evidence from Guangxi Zhuang birth cohort in China

Characteristics UW (n = 255) NW (n = 753) OW (n = 74) P-value
Newborn
 sex     0.008
  Female 139 (54.5%) 331 (44.0%) 30 (40.5%)  
  Male 116 (45.5%) 422 (56.0%) 44 (59.5%)  
 Gestational age, weeks 38.67 (1.19) 38.65 (1.26) 38.68 (1.23) 0.963
 Birth weight, g 3006.75 (360.39) 3144.57 (379.27) 3264.05 (421.81) < 0.001
Maternal
 Age, years 26.68 (4.99) 28.75 (5.12) 32.46 (4.50) < 0.001
Residential place     0.658
 Urban areas 14 (5.5) 49 (6.5) 6 (8.1)  
 Rural areas 241 (94.5) 704 (93.5) 68 (91.9)  
 Parity, n     < 0.001
  1 138 (54.1%) 283 (37.6%) 19 (25.7%)  
  ≥ 2 117 (45.9%) 470 (62.4%) 55 (74.3%)  
 Gravidity, n     < 0.001
  1 82 (32.2%) 145 (19.3%) 8 (10.8%)  
  ≥ 2 173 (67.8%) 608 (80.7%) 66 (89.2%)  
 Drinking pre-pregnancy, n     0.361
  No 248 (97.3%) 733 (97.3%) 74 (100%)  
  Yes 7 (2.7%) 20 (2.7%) 0 (0.0%)  
 Smoking pre-pregnancy, n     0.657
  No 254 (99.6%) 752 (99.9%) 74 (100%)  
  Yes 1 (0.4%) 1 (0.1%) 0 (0.0%)  
 Passive smoking during pregnancy, n    0.919
  No 97 (38.0%) 294 (39.0%) 30 (40.5%)  
  Yes 158 (62.0%) 459 (61.0%) 44 (59.5%)  
 Pregnancy comorbidities or complications, n    0.081
  No 231 (90.6%) 659 (87.5%) 60 (81.1%)  
  Yes 24 (9.4%) 65 (12.5%) 14 (18.9%)  
Cesarean section, n 59 (23.1%) 220 (29.2%) 24 (32.4%) 0.119
Paternal
 Age, years 29.33 (5.20) 31.72 (5.60) 35.49 (4.96) < 0.001
 Drinking pre-pregnancy, n     0.204
  No 46 (18.0) 99 (13.1) 14 (18.9)  
  Yes 117 (45.9) 338 (44.9) 31 (41.9)  
  Missing 92 (36.1) 316 (42.0) 29 (39.2)  
 Smoking pre-pregnancy, n     0.366
  No 63 (24.7) 192 (25.5) 18 (24.3)  
  Yes 100 (39.2) 245 (32.5) 27 (36.5)  
  Missing 92 (36.1) 316 (42.0) 29 (39.2)  
 BMI, kg/m2 21.85 (1.61) 22.17 (1.36) 22.24 (1.62) 0.007
 BMI categories, n     0.751
  HW 237 (92.9%) 691 (91.8%) 67 (90.5%)  
  OW 18 (7.1%) 62 (8.2%) 7 (9.5%)  
  1. Values are presented as mean (SD), n (%)
  2. Abbreviation: BMI Body mass index, UW Underweight, NW Normal weight, OW Overweight, HW Healthy weight (normal and underweight)