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"The 375 studies produced 833 effect size measures (more than 2 per study), and yielded an average effect size of .68.[...]This effect would (a) be classified as between a medium and large effect in the social sciences, (b) mean that the average client receiving therapy would be better off than 75% of untreated clients [...]translate into a success rate of 34% for the control group compared with a success rate of 66% for the treatment group."(Wampold, 66)[My apologies for misquoting more than once the overall benefits of therapy, which I confuse too often with the percentage doing better than the untreated sample. It must be a Freudian slip on my part.]In 1994 Lambert and Bergin conducted another meta-analysis that found "the average effect associated with psychological treatment approaches one standard deviation unit," in other words, an effect size approaching 1.00. Other work from the 90s supports this data.
posted by ThePinkSuperhero at 6:54 AM on March 27, 2006 [1 favorite]