In the confirmation set , the predefined cut points for this model classified patients into three subsets with differential benefit from trastuzumab with hazard ratios of @ ( @ % confidence interval -LSB- CI -RSB- = @ to @ ; P = @ ; n = @ ) , @ ( @ % CI = @ to @ ; P = @ ; n = @ ) , and @ ( @ % CI = @ to @ ; P < @ ; n = @ ; P ( interaction ) between the model and trastuzumab < @ ) .