Patients in the decision aid group had significantly better knowledge ( 10.0 vs. 9.4 out of 13 points ; p = .04 ) , whereas anxiety levels ( 4.4 and 5.0 on a 0-21 scale ; p = .73 ) and satisfaction scores ( 74 and 73 on a 0-100 scale ; p = .81 ) were similar in both groups .