We don’t know the population rate of how often these happen, but we do know that they happen. We have published multiple survey studies on such enduring negative psychological effects, e.g., https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5551678/ . This was survey work probing folks who claimed to have had a challenging experience, but among these there was a clear signal for some people to have long lasting disturbances. I’ve been approached by a many such folks. I would note that we have not seen this in the modern or older eras of research when good screening and safety practices are in place.
We don’t know the population rate of how often these happen, but we do know that they happen. We have published multiple survey studies on such enduring negative psychological effects, e.g., https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5551678/ . This was survey work probing folks who claimed to have had a challenging experience, but among these there was a clear signal for some people to have long lasting disturbances. I’ve been approached by a many such folks. I would note that we have not seen this in the modern or older eras of research when good screening and safety practices are in place.