Social Deprivation Index ranges from 0 (least deprived) to 100 (most deprived) and was divided by 10 for reporting. Adjustments were for age, sex, pediatric intensive care unit length of stay before screening date, Pediatric Risk of Mortality III score, year of screening, elective or nonelective admission, origin of admission, and study type (observational or interventional). Other race included American Indian or Alaska Native, Asian, Native Hawaiian or Other Pacific Islander, multiracial, other, and refused. NA indicates not applicable.