Is there any data out there on how successful code schools are in terms of job placement and more importantly longer term success in hands-on coding (non-manage

Is there any data out there on how successful code schools are in terms of job placement and more importantly longer term success in hands-on coding (non-managerial)? I've always had a perception (perhaps wrongly) that people who code are somewhat natural at it and don't need to be taught. Honestly I've never met anyone that was any good that was taught to code in school or by a book.