Estimated OR of disease risk for ACs and ATL and HAM/TSP patients in Jamaica. The HTLV-I–infected groups: Model 1, comparing HAM/TSP patients and ACs; Model 2, comparing HAM/TSP and ATL patients; and Model 3, comparing ATL patients and ACs were modeled and classified in conjunction with sex, race, and age using the Ab responses for Gag, Env, and Tax. Corresponding OR and P values for the resulting classifications were calculated using the method of Wald.