Variable | n | % |
---|---|---|
Mothers | Â | Â |
 Age |  |  |
   < 25 | 24 | 2.6 |
  25–29 | 305 | 33.6 |
  30–35 | 375 | 41.3 |
   > 35 | 204 | 22.5 |
 Nationality |  |  |
  Han | 756 | 83.3 |
  Others | 152 | 16.7 |
 Educational level |  |  |
  Junior high school and below | 91 | 10.0 |
  High school and technical secondary school | 70 | 7.7 |
 Bachelor degree/college or above | 634 | 69.8 |
  Postgraduate or above | 113 | 12.5 |
 household income yearly |  |  |
   < 3 | 167 | 18.4 |
  3–5 | 417 | 46.0 |
  5–7 | 86 | 9.5 |
   > 7 | 238 | 26.1 |
 Gravidity |  |  |
  1 | 409 | 45.1 |
  2 | 274 | 30.2 |
   ≥ 3 | 225 | 24.7 |
 Parity |  |  |
  0 | 652 | 71.9 |
   ≥ 1 | 256 | 28.1 |
 Pre-pregnancy BMI(kg/m2) |  |  |
   < 18.5 | 61 | 6.7 |
  18.5 < 23.9 | 438 | 48.3 |
  24.0 < 27.9 | 274 | 30.2 |
   ≥ 28.0 | 135 | 14.8 |
 GWG |  |  |
  Insufficient | 112 | 12.4 |
  Appropriate | 344 | 37.8 |
  Redundancy | 452 | 49.8 |
 Caesarean section |  |  |
  Yes | 426 | 46.9 |
  No | 482 | 53.1 |
 Gestational age(week) |  |  |
   < 37 | 84 | 9.3 |
   ≥ 37 | 824 | 90.7 |
 Gestational diabetes |  |  |
  Yes | 212 | 23.4 |
  No | 696 | 76.3 |
 Gestational hypertension |  |  |
  Yes | 144 | 15.9 |
  No | 774 | 84.1 |
Infants | Â | Â |
 Sex |  |  |
  Male | 449 | 49.4 |
  Female | 459 | 50.6 |
 Birth weight |  |  |
   < 2500 | 95 | 10.5 |
  2500–3999 | 747 | 82.3 |
   ≥ 4000 | 66 | 7.2 |
 Growth Level |  |  |
  GA | 50 | 5.5 |
  AGA | 782 | 86.1 |
  LGA | 76 | 8.4 |