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Understanding patients' length of stay at far-forward Role 2 surgical units may help to determine support needs, stabilization requirements, predeployment training, and necessity of increased care capability before or during transport to a higher level of care. The objectives of this study were to (1) evaluate the amount of time patients spent at Role 2 and (2) determine the factors associated with trauma patients' length of stay at Role 2.We conducted a secondary data analysis of the Joint Trauma System Role 2 Database. Logistic regression was used to determine factors associated with extended length of stay at Role 2.There were 7,912 study patients, and the overall median (interquartile range) amount of time patients spent at Role 2 was 2.5 (1.2–5.5) hours. The adjusted odds ratio (aOR) of extended stay for civilian/other forces and non–US military patients were 1.2 (95% confidence interval [CI], 1.0–1.4) and 1.4 (95% CI, 1.2–1.7) times higher as compared with US military patients, respectively. The aOR of extended stay were higher for patients who received blood transfusions (aOR, 1.4; 95% CI, 1.2–1.6), surgical procedures (aOR, 1.6; 95% CI, 1.4–1.8), or did not use a tourniquet (aOR, 1.2; 95% CI, 1.0–1.5). As compared with those injured by an explosion, the adjusted odds of extended stay were 1.2 (95% CI, 1.0–1.4) times higher for patients injured by another mechanism. The odds of extended stay were lower (aOR, 0.3; 95% CI, 0.2–0.5) for patients who died and higher (aOR, 1.4; 95% CI, 1.2–1.6) for transferred patients as compared with patients who returned to duty.In this study, interventions, patient affiliation, discharge status, and injury mechanism were associated with length of stay at Role 2. Our study results will help inform training and current Role 2 logistic and personnel support needs.Prognostic, level III.