Figure 1. Patient-reported locus of decision-making control in relation to the Merenstein case (N = 431 question respondents).

Note: The figure shows patients’ responses to the survey question, "How was the decision made today on whether to do a PSA blood test? (A) I made the decision on whether to order a PSA test. (B) I made the decision about whether to order a PSA test after seriously considering my doctor’s opinion. (C) My doctor and I shared the responsibility for deciding whether to order a PSA test. (D) My doctor made the final decision about whether to order a PSA test after seriously considering my opinion. (E) My doctor made the decision whether to order a PSA test." Before period = January 2002 through June 2003; diffusion period = July 2003 through December 2003; after period = January 2004 through November 2004. The differences across the 3 time periods are not significant (P = .54).