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Table 2 Socio-demographic characteristics of women in different preconception risk factor classification categories

From: China’s community-based strategy of universal preconception care in rural areas at a population level using a novel risk classification system for stratifying couples´ preconception health status

   No risk factors A B C D X
Age ≤25 24.7% 21.6% 26.3% 22.4% 14.7% 21.3%
  25–30 46.3% 47.4% 46.7% 44.1% 38.5% 46.0%
  30–35 19.5% 21.2% 18.2% 20.9% 27.1%* 20.1%
  ≥35 9.6% 9.8% 8.7% 12.6% 19.8%* 12.6%*
Area Rural area 93.9% 89.6% 94.0% 94.0% 94.3% 92.2%
Race Han 92.7% 91.6% 92.5% 88.7% 84.0%* 84.2%*
Education Secondary school or lower 71.5% 64.8%* 69.4% 71.8% 77.4% 75.5%
  High school 18.7% 19.7% 18.7% 17.1% 13.8%* 16.6%
  College or higher 9.8% 15.5%* 11.8% 11.1% 8.8% 8.0%
  1. *P value <0.05 compared with those women having no risk factors