Stacey D, Bennett CL, Barry MJ, et al. Decision aids for people facing health treatment or screening decisions. Cochrane Database Syst Rev. 2011 Oct 5;(10):CD001431.
This is the most comprehensive review article that examines evidence of patient decision aids from numerous randomized control trials and provides a strong evidence base for the positive benefits of patient decision aids. The review finds that when patients use decision aids they: a) improve their knowledge of the options b) have more accurate expectations of possible benefits and harms c) reach choices that are more consistent with their informed values and d) participate more in decision making.