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| Status of family history | ||
|
| ||
| Positive | Negative | |
| Parity | ||
| < 2 | 5.81 (2.32-14.57) | 3.01 (1.84-4.92) |
| ≧ 2 | 2.11 (1.19- 3.74) | 1.00 |
