Access to trauma centers in the United States.

Context: Previous studies have reported that the number and distribution of trauma centers are uneven across states, suggesting large differences in access to trauma center care.

Objective: To estimate the proportion of US residents having access to trauma centers within 45 and 60 minutes.

Design And Setting: Cross-sectional study using data from 2 national databases as part of the Trauma Resource Allocation Model for Ambulances and Hospitals (TRAMAH) project.