目的：瞭解外傷病人住院天數及分析不同特性外傷病人與住院天數之相關性。 方法：以病歷回溯方式分析 2013年台南某醫學中心外傷住院病人之性別、年齡、外傷嚴重度、以及接受手術與否等變項和加護病房住院天數及住院天數的相關性。 結果：外傷嚴重度和加護病房住院天數、住院天數呈顯著正相關；極嚴重外傷及有接受手術病人其加護病房住院天數及住院天數皆比其他組長；而外傷嚴重度每增加 1分會增加 0.496天加護病房住院天數及 0.656天的住院天數；接受手術的病人也比未接受手術的病人多 3.432天加護病房住院天數及 3.12天住院天數。 結論：外傷嚴重度與接受手術是加護病房住院天數與住院天數的主要影響因素，亦可預測住院天數。本結果可以提供各醫學中心對於外傷住院天數之管理作為參考。

OBJECTIVES: The purpose of this study was to determine trauma patient length of stay (LOS) and the association between LOS and trauma patient demographic and clinical characteristics. METHODS: This was a retrospective study. We ascertained the differences and correlations between gender, age, injury severity score (ISS), surgical status, and intensive care unit (ICU) stay and LOS among trauma patients admitted to a Tainan medical center in 2013. RESULTS: The ISS was significantly correlated with ICU stay and LOS. The ICU stay and LOS in patients with extremely severe trauma (ISS ≧ 25) who underwent surgery were significantly longer than any other group. In addition, the ICU stay and LOS increased by 0.496 and 0.656 days per incremental increase in ISS. The ICU stay and LOS of patients who underwent surgery were 3.432 and 3.12 days longer than patients who did not have surgery. CONCLUSIONS: The ISS in trauma patients who underwent surgery was a major predictor of ICU stay and LOS. The results of this study can serve as a reference for managing LOS of trauma patients in medical centers.