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Association of adverse obstetric history with alloimmunisation.
| Antibodies detected | Antibodies not detected | |
|---|---|---|
| Adverse obstetric history present (n=509) | 28 | 481 |
| Adverse obstetric history absent (n=3,068) | 16 | 3,052 |
P<0.001, odd’s ratio=11.10 (95% confidence interval=5.75–21.64)
