Prospective association of TRAb at diagnosis with the risk for relapse. (a) Association of TRAb with risk for relapse. Log relative hazards of relapse risk (black lines) with 95% CIs (gray areas) were plotted against TRAb, adjusting for age, sex, race, smoking status, and TPOAb. P values for interactions of TRAb with age, sex, race, smoking status, and TPOAb levels were 0.01, 0.3, 0.9, 0.9, and 0.8, respectively. (b) Association of TRAb with risk for relapse among age tertiles.