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Figure 1 Probability of Any Cardiac Event

Kaplan-Meier estimate of the cumulative probability of any cardiac event (syncope/aborted cardiac arrest [ACA]/long QT syndrome [LQTS]-related sudden death) after age 18 years among mutation-carrying subjects on the basis of: (A) corrected QT interval; (B) number of cardiac events before age 18 years; (C) gender; and (D) genotype. The p value was computed with the log-rank test, and they are unadjusted for covariates. The numbers of subjects remaining at risk are given at 5-year intervals beginning at age 25 years, with the numbers in parentheses indicating the cumulative probability of a cardiac event at the specified age.