Table 1 Characteristics of 123 pregnant Chinese women in the study, January 2013 to April 2014
Characteristics | Subjects |
|---|---|
Age (years), mean (SD) | 28.1(3.7) |
Weight (kg), mean (SD) | 55.0(9.5) |
Height (m), mean (SD) | 1.61(0.49) |
Weekly weight gain between two FFQs(kg), mean (SD) | 0.42(0.37) |
Age (years), n(%) | Â |
  ≤25 | 31(25.2) |
  26-30 | 67(54.5) |
  ≥31 | 25(20.3) |
Pre-pregnancy BMI ( kg/m2), n(%) | Â |
  <18.5 | 35(28.5) |
  18.5-23.9 | 72(58.5) |
  24.0-27.9 | 12(9.8) |
  ≥28 | 4(3.2) |
Education (schooling years), n(%) | Â |
  ≤9 | 8(6.5) |
  10-12 | 22(17.9) |
  13-15 | 38(30.9) |
  ≥16 | 52(42.3) |
Missing values | 3(2.4) |
Parity, n(%) | Â |
  0 | 108(87.8) |
  ≥1 | 15(12.2) |
Average personal income (yuan/ month, 1 yuan = 0.16 US Dollars), n (%) | |
  ≤1000 | 2(1.6) |
  1001-2999 | 29(23.6) |
  3000-4999 | 54(43.9) |
  5000-9999 | 34(27.6) |
  ≥10000 | 4(3.3) |
Health status or lifestyle variables during first trimester, n (%) | |
The presence of nausea or vomiting | 80(65.0) |
Use of supplements | 115(93.5) |
Drinking | 5(4.1) |
Smoking or passive smoking | 12(9.8) |