Meta-Analysis of Therapist Effects in Psychotherapy Outcome Studies.
P Crits-Christoph, K Baranackie, J Kurcias, A Beck, K Carrol... Psychotherapy Research 1991
In a meta-analysis, we examined factors that could account for the differences in therapist efficacy evidenced in psychotherapy outcome studies. The factors investigated were: (1) the use of a treatment manual, (2) the average level of therapist experience, (3) the length of treatment, and (4) the type of treatment (cognitive/behavioral v...