目的：由於個案的流失可能造成醫療的延遲或增加資源的浪費，故本研究調查民國91年在中臺灣某療養院接受門診個別心理治療轉介個案的流失狀況，並探討與流失率、治療次數有關的因素。 方法：本研究採事後回溯及檔案整理的研究方法。並採立意取樣，期間為民國91年1至12月接受門診個別心理治療轉介的個案，共計176個案次。 結果：本研究所蒐集的176個案次，平均為37.6歲，診斷方面，精神官能症與適應性疾患佔59.3％，精神病佔41.4％。心裡治療流失率為39.4％；所有個案的平均治療次數為5.14次，治療次數中數為3次，眾數為1次。其中，1-4次者佔64.3％。研究在流失與各項自變項間的關聯，發現男性比女性治療師有較高的個案流失比例，而治療次數愈多，則流失機會愈少。此外個案年紀與治療次數呈負相關。 結論：三成多的個案在治療中流失，且六成多個案在四次會談內結束，可見心理治療個案的流失是很容易發生的問題，其因素與治療師的性別以及治療次數有關。本文對流失原因與如何預防提供初步的討論。

Objective: We invetigated the factors that contributed to the dropout from psychotherapy sessions in an outpatient department of a psychiatric center in central Taiwan. Method: We retrospectively analyzed intake and referral data from 176 patients undergoing individual psychotherapy outpatient department from January to December 2002. Results: The average age of patients were 37.6 years. Of the 176 patients studied, 59.3% were diagnosed as having either neurotic or adjustment disorders and 41.4% were diagnosed as having psychotic disorders. The dropout rate was 39.4% and the average psychotherapy session per patient was 5.14, (median, 3 ; mode, 1). We found that 64.3% of patients attended from one to four treatment sessions before dropping out. Patients treated by male therapists had a higher dropout rate than those treated by female therapists. Patients who received more therapy sessions had a lower dropout rate. Patient age was negatively correlated with the number of sessions attended. Conclusion: About one-third of patients dropout from pychotherapy, and two-thirds of patients terminate within 4 sessoins. The patient dropout rate is closely correlated with the gender of the therapist and the number of psychotherapy sessions attended.