Cost-Effectiveness Analyses. Hospital days will be computed as the number of hospital days after admission to any of the four services (not including any days spent in other hospitals or the pediatric ICU before transfer to one of these services) and any subsequent readmission occurring within 30 days of discharge. These data will be obtained by searching the claims data for the 13 Memorial Hermann Health System hospitals. Hospitalizations outside this system will be identified for high-risk chronically ill children as part of a separate ongoing QI study. If as expected, parent satisfaction is increased and/or arrangements for care after discharge is greater with hospitalist care, any rehospitalizations not identified would be expected to be less with hospitalist care, a factor that would result in a conservative estimate of any reduction in total hospital days with such care.