Table 5.

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 TestedExplanatory VariablesOR (95% CI)p
Unaffected family members*0901Eliminated
Any SEEliminated
SE/*09014.66 (1.16, 18.66)0.030
Constant0.17< 0.0001
  • The Cox and Snell R-square value for the regression was 0.025.