"Research by Lester Luborsky, a clinical psychologist at the University of Pennsylvania and author of ''Who Will Benefit from Psychotherapy?'' published this fall, provides more reason to treat the matter with some urgency. He has found that up to a tenth of all patients may actually be harmed by therapy - their problems get worse or they end up frustrated or unhappy with the course of treatment."
https://www.nytimes.com/1988/10/09/m...t-and-why.html