Regression analysis for risk of anti-CCP antibody due to shared epitope and DRB1*0901 in unaffected family members. One hundred thirty-nine unaffected relatives with negative and 27 with positive anti-CCP antibody tests were entered into the regression.
| Population Tested | Explanatory Variables | OR (95% CI) | p |
|---|---|---|---|
| Unaffected family members | *0901 | Eliminated | |
| Any SE | Eliminated | ||
| SE/*0901 | 4.66 (1.16, 18.66) | 0.030 | |
| Constant | 0.17 | < 0.0001 |
The Cox and Snell R-square value for the regression was 0.025.