Maximally selected log-rank statistics for age. Maximally selected log-rank statistics performed for age to test for a potential cut point separating 2 groups with different survival distributions. Age is shown on the x-axis, corresponding standardized log-rank statistics are shown on the y-axis. The estimated cut-off point was 70.42 years with an M statistics of 6.06 and a corresponding corrected P < .001. Vertical dashed line represents the age cut point evident on maximally selected log-rank statistics and the corresponding M statistics. Horizonal line represents the minimal level of significance based on M statistics.