Patients in states with the "most inclusive" trauma systems had a 30% lower risk of nephrectomy (RR, 0.70; 95% confidence interval [CI], 0.56-0.88) and a 2.06% lower unadjusted inpatient case fatality rate compared with states with "exclusive" trauma systems. Inpatient case fatality risk varied significantly by trauma system inclusiveness. Patients treated in states with either a "more inclusive" (RR, 0.85; 95% CI, 0.74-0.97) or "most inclusive" (RR, 0.74; 95% CI, 0.64-0