Koss M P
J Clin Psychol. 1980 Oct;36(4):991-3. doi: 10.1002/1097-4679(198010)36:4<991::aid-jclp2270360430>3.0.co;2-q.
Investigated the characteristics predictive of long-term stay in private practice psychotherapy in a population of 64 "long-term" clients (remained longer than 25 sessions, mean = 47 sessions) and 88 "short-term" clients (terminated before 25 sessions, mean = 7 sessions). Data consisted of T-scores on the intake MMPI and two variables (possession of insurance coverage and use of psychoactive medication) on which long and short-term clients had been found to differ in other research. Stepwise multiple regression analysis was performed and revealed that MMPI scales 2 and 0 added to the prediction of length of stay in psychotherapy (p < .01). Insurance and medication were significant predictors only when MMPI data were not used.
对64名“长期”来访者（治疗时长超过25次，平均为47次）和88名“短期”来访者（治疗次数少于25次，平均为7次）组成的群体进行研究，探寻私人执业心理治疗中预测长期治疗的特征。数据包括初次明尼苏达多项人格测验（MMPI）的T分数以及另外两个变量（是否拥有保险和是否使用精神活性药物），在其他研究中发现长期和短期来访者在这两个变量上存在差异。进行了逐步多元回归分析，结果显示MMPI量表2和量表0可增强对心理治疗时长的预测能力（p <.01）。只有在不使用MMPI数据时，保险和药物才是显著的预测因素。
