Table VII.
Relationship between genetic system and time to non-persistence
| Genetic System | Hazard Ratio | 95% CI | p |
|---|---|---|---|
| Duffy | 0.842 | 0.308–2.299 | NS |
| Kell | 1.326 | 0.920–1.913 | NS |
| Kidd | 1.386 | 0.787–2.442 | NS |
| Lewis | 1.839 | 1.017–3.323 | 0.044 |
| Lutheran | 1.625 | 0.584–4.518 | NS |
| MNSs | 1.025 | 0.568–1.850 | NS |
| Other | 3.923 | 1.949–7.897 | <0.001 |
| Unidentified | 3.494 | 2.342–5.213 | <0.001 |
In the Cox regression analysis, genetic system was entered instead of antibody specificity. Hazard ratios are calculated with reference to Rh antibodies. All statistically significant covariates have greater hazard ratios than that of Rh antibodies.