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Table 1 Characteristics of 123 pregnant Chinese women in the study, January 2013 to April 2014

From: Reproducibility and relative validity of a semi-quantitative food frequency questionnaire for Chinese pregnant women

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(%)  
  ≤25 31(25.2)
  26-30 67(54.5)
  ≥31 25(20.3)
Pre-pregnancy BMI ( kg/m2), n(%)  
  <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(%)  
  ≤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(%)  
  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)