CBT and other forms of therapy often require a certain intellectual sophistication, in order for people to actually understand what is demanded. Likewise the most hopeless cases are often not considered (they would need a lot of sessions); natural relapse is not considered, and neither is the placebo effect. All these effects add to a relatively high success rate.
Similar problems exist for sleeping medication. Although chances that a certain medication is effective are quite high, but if you would correct for natural relapse and placebo effects the percentages would be a lot lower, sadly.
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