Interphysician Differences in Emergency Department Length of Stay

Background: Emergency physicians differ in many ways with respect to practice. One area in which interphysician practice differences are not well characterized is emergency department (ED) length of stay (LOS). Objective: To describe how ED LOS differs among physicians. Methods: We performed a 3-year, five-ED retrospective study of non-fast-track visits evaluated primarily by physicians. We report each provider's observed LOS, as well as each provider's ratio of observed LOS/expected LOS (LOS_O/E); we determined expected LOS based on site average adjusted for the patient characteristics of age, gender, acuity, and disposition status, as well as the time characteristics of shift, day of week, season, and calendar year. Results: Three hundred twenty-seven thousand, seven hundred fifty-three visits seen by 92 physicians were eligible for analysis. For the five sites, the average shortest observed LOS was 151 min (range 106–184 min), and the average longest observed LOS was 232 min (range 196–270 min); the average difference was 81 min (range 69–90 min). For LOS_O/E, the average lowest LOS_O/E was 0.801 (range 0.702–0.887), and the average highest LOS_O/E was 1.210 (range 1.186–1.275); the average difference between the lowest LOS_O/E and the highest LOS_O/E was 0.409 (range 0.305–0.493). Conclusion: There are significant differences in ED LOS at the level of the individual physician, even after accounting for multiple confounders. We found that the LOS_O/E for physicians with the lowest LOS_O/E at each site averaged approximately 20% less than predicted, and that the LOS_O/E for physicians with the highest LOS_O/E at each site averaged approximately 20% more than predicted.