"than the first: it concluded that the new wave of antidepressants heralded as wonder drugs –Prozac, Seroxat (Paxil in the US), Lustral (Zoloft), Dutonin (Serzone), Cipramil (Celexa) and Effexor –worked no better than dummy pills for the vast majority of patients. There were about 10 to 15 per cent of people, the extremely depressed, for whom these pills worked in a very minor way (about 4 points better than placebos on the Hamilton Scale), but this meant, as Kirsch pointed out, that ‘85 to 90 per cent of people being prescribed antidepressants are not getting any clinically meaningful benefit from the drug itself’. •"
Direct quote above, I'd gone up to 95% in my head (I think that's about a later bit in the chapter).