ABSTRACT Title of thesis: INPATIENT MORTALITY IN EMERGENCY CARE: IS COMPETITION ALWAYS GOOD?

Title of thesis: INPATIENT MORTALITY IN EMERGENCY CARE: IS COMPETITION ALWAYS GOOD? Veronica Kwok, Master of Health Services Administration, 2014 Thesis directed by: Assistant Professor, Jie Chen Department of Health Services Administration The objective of this study was to measure the association between regional competition and emergency care outcomes. Competition was measured using the Herfindahl-Hirschman Index for three hospital referral regions in Maryland. Preliminary regression analysis using a logistic binary model showed that higher competition was associated with lower odds of mortality. Further investigation suggested that competition could be endogenous. Further regression analysis using an instrumental variable of hospital system affiliation and two-stage least squares estimation showed that lower competition was associated with lower odds of mortality for sepsis and trauma (OR = 0.7, p-value <0.001, OR = 0.5, p-value <0.001, respectively). Future investigation perhaps on a national level could help identify a stronger, more uniform association between competition and emergency care outcomes including large scale events, and as such provide policy guidance for quality of emergency care. INPATIENT MORTALITY IN EMERGENCY CARE: IS COMPETITION ALWAYS GOOD? By Veronica Kwok Thesis submitted to the Faculty of the Graduate School of University of Maryland, College Park in partial fulfillment of the requirements for the degree of Master of Health Services Administration 2014 Advisory Committee: Assistant Professor Jie Chen, Chair Assistant Professor Karoline Mortensen Benoit Stryckman Dr. Brendan Carr