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