Cumulative incidence curves of NRM by age group. Curves compare patients age 10 years or younger and older than age 10 years. The NRM at 1 year was 10.8% (95% CI, 5.52%-14.64%) for the age 0 to 10 years group and 13.0% (95% CI, 8.70%-17.26%) for the older than age 10 years group (P = .41).