PSA test to screen for prostate cancer is considered a preference sensitive decision, meaning it does not only depend on what is best from a medical point of view, but also on patient values. Decision aids are evidence-based tools which showed to help people feel clearer about their values, therefore it has been advocated that decision aids should contain a specific values clarification method (VCM). VCM may be either implicit or explicit but the evidence concerning the best method is scarce. We aim at comparing the perceived clarity of personal values in men considering PSA screening using decision aids with no VCM versus an implicit VCM versus an explicit VCM.
