為了解機車交通事故的傷害嚴重度，本研究針對全國各區域及城鄉進行合理的樣本分配，透過郵寄問卷方式取得機車事故住院騎士過去一年病史、事故發生時的個人及道路環境、住院治療狀況、過去駕駛行為經驗、生活質量等資料，連結醫院端的傷害嚴重度數據，利用統計分析，找出影響機車交通事故傷害嚴重度的危險因子。結果發現包括年齡上的雙峰現象（18-21 歲及≧65 歲）、慢性病（包括貧血、糖尿病、視障及聽障）、騎車前酒精及提神物的使用、事故發生所在的道路速限及當時行車速度等，都是住院騎士傷害嚴重度的危險因子。本研究成果可提供未來道安權責單位在規劃機車事故傷害防治工作及介入方法時的依據，機車駕駛行為對於事故傷害嚴重度的影響也值得後續深入分析。

To realize the injury severity of motorcycle accidents, we designed a nationwide sampling survey among riders who hospitalized due to a motorcycle crash. The information of the motorcycle crashes including demographic, comorbidities, riding habits, environmental factors, crash factors, treatment outcomes, and quality of life were collected by questionnaires and were linked to hospital data. Statistical methods were used to identify the risk factors of the injury severity of motorcycle accidents. Our results showed that age 18-21 years, age ≥ 65 years, comorbidities (including anemia, diabetes, visual and hearing impairment), use of alcohol and refreshing stimulants, and speeding, were associated with certain injury indicators. Our study provided valuable information for road safety authorities to prevent severe motorcycle injuries. The impact of riding behaviors on motorcyclist injury severity is worthy of further research.