本研究旨在探討時間成本與金錢成本對病患使用醫學中心門診量之影響，以及時間成本與金錢成本對門診利用量的價格彈性。研究設計係以系統抽樣抽取10%門診病人後，發給自填式問卷以取得病患之人口學資料、個人所得、全家所得、健康狀況、就醫所付出的時間和金錢等資料，病人過去六個月的醫療利用次數、掛號方式與保險類別等資料則取自醫院電腦檔案。以門診利用次數為依變項進行複迴歸分析結果顯示年紀越大、自我健康評量越差、由醫師預約、對此醫學中心的服務或此醫學中心的醫師有偏好以及付出的時間成本越少的病人（p<0.05），傾向使用較多次的門診。時間 成本雖為影響就醫次數的重要因素之一，但其彈性值相當的低（0.05）。所得收入與就醫所付出的金錢成本則對門診的利用次數無顯著影響。

　　　　　The objects of the study are to determine the influence of time cost and monetarv cost on the utilization of the outpatient service in a medical center, and to estimate the elasticities of both costs. Systemic sampling was used to obtain 10% sample patients in the outpatient department during the survey period. With the survey and the exiraction of data from the hospital computer file, information about each patient's utilization amount in the latest six months, diagnosis, demographic characteristics, individual wage, family income, health condition, monetary cost and time cost needed for the latest visit is collected. Results of multiple regression analysis, using utilization amount as the dependent variable, indicate that patients who are older, have worse self-evaluated health status, have appointments in advance, have preferences for the doctors or services of this hospital, and paid less time cost, tend to use more of the ambulatory care in this hospital (p<0.05). Despite that time cost is a significant factor, its elasticity is quite low (0.05). On the other hand, both income and monetary costs do not significantly influence the utilization of outpatient services.