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Table 1 Baseline characteristics of study participants by number of pregnancies

From: Pregnancy, pregnancy loss, and the risk of cardiovascular disease in Chinese women: findings from the China Kadoorie Biobank

  Total 0 pregnancies 1 pregnancy 2 pregnancies 3 pregnancies 4 pregnancies ≥5 pregnancies
Number of women (N) 289,573 2809 (1.0) 26,891 (9.3) 76,137 (26.3) 76,802 (26.5) 50,779 (17.5) 56,155 (19.4)
Rural, % 56.8 40.1 37.9 56.3 58.4 59.6 61.0
Age, years 50.5 (10.3) 49.9 (11.5) 44.2 (7.7) 46.1 (8.0) 49.4 (9.0) 53.1 (9.9) 58.8 (10.4)
Education level, %
 Primary or below 56.8 43.3 32.6 49.3 56.1 62.6 74.7
 Secondary or above 43.2 56.7 67.4 50.7 43.9 37.4 25.3
Household income, %
 Low 10.2 12.1 5.3 6.8 8.4 11.5 18.4
 Middle 49.1 52.3 43.7 46.9 48.9 50.6 53.5
 High 40.7 35.6 51.1 46.4 42.8 37.9 28.1
Current smoking, % 4.9 6.7 3.4 2.9 4.0 5.6 8.9
Regular alcohol use, % 36.5 42.1 41.7 35.7 36.3 36.4 35.2
Physical activity (MET hours/day) 17.2 (11.0, 28.7) 14.8 (9.3, 24.7) 20.3 (12.8, 31.8) 20.4 (12.3, 32.3) 18.3 (11.2, 30.0) 15.7 (10.3, 26.6) 12.9 (8.4, 21.1)
Systolic blood pressure, mmHg 129.4 (21.8) 127.7 (23.0) 123.0 (18.6) 126.1 (19.9) 128.7 (21.3) 131.6 (22.3) 136.0 (23.8)
Body mass index, kg/m2 23.8 (3.4) 23.4 (3.8) 23.6 (3.3) 23.7 (3.3) 23.8 (3.4) 23.9 (3.5) 23.8 (3.6)
History of hypertension, % 10.2 9.0 5.5 7.2 9.7 12.4 15.6
History of diabetes, % 2.9 2.7 1.4 1.8 2.6 3.3 4.9
Pregnancy loss, %
 History of miscarriage 9.8 0.6 2.3 7.3 12.2 21.2
 History of induced abortion 52.8 1.3 44.4 60.2 65.1 65.1
 History of stillbirth 6.5 0.3 1.2 4.0 7.2 14.7
Ever use of oral contraceptives, % 9.8 2.2 5.6 8.4 10.9 11.7 11.0
  1. Values are percentages for categorical variables, and means and standard deviations for continuous variables, expect for physical activity where median and 25th and 75th percentiles are shown
  2. MET metabolic equivalent