Cumulative probability of stroke according to ENPP1 K173Q genotype. (A) The cumulative probability for the KK genotype group was 0% whereas that for the QQ group was 7.1% (SE, 2.6%; P = .015). (B) The cumulative probability for the KK genotype group was 0% whereas that for the QQ or KQ group was 8.7% (SE, 1.8%; P = .011). Function: (1-survival), according to the Kaplan-Meier method. SE, standard error.