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Table 3 Correct responses to knowledge items for each sample

From: Development and evaluation of a new survey instrument to measure the quality of colorectal cancer screening decisions

  Online Providers Clinic sample
  Sample   
Question (correct answer) DA No DA   
N = 163 N = 175 N = 115 (%) N = 94 (%)
1. At what age do doctors usually recommend people start getting regular tests for colon cancer? (50)* 150 (92%) 126 (72%) 114 (99%) 50 (53%)
2. Out of every 100 people about how many will get colon cancer some time in their lives? (6)* 109 (67) 63 (36%) 66 (57%) 6 (6%)
3. Does having a colon cancer test result that is not normal always mean that a person has colon cancer? (No) 155 (95%) 168 (96%) 113 (98%) 81 (86%)
4. How often do serious problems, such as serious bleeding or a tear in the colon, happen as a result of a colonoscopy? (Rarely)* 151 (93%) 125 (71%) 109 (95%) 55 (59%)
5. For a person with an average risk for colon cancer, which test do doctors recommend be done every year? (Stool blood test)* 140 (86%) 96 (55%) 112 (97%) 28 (30%)
6. For a person with an average risk for colon cancer, which test do doctors recommend be done every 10 years? (Colonoscopy)* 147 (90%) 115 (66%) 111 (97%) 48 (51%)
7. How does regular testing for colon cancer change the chances that a person will die from colon cancer? (Decreases chance) 156 (96%) 160 (91%) 113 (98%) 70 (75%)
8. Which colon cancer test is least likely to miss a cancer? (Colonoscopy)* 92 (56%) 72 (41%) 100 (87%) 21 (22%)
9. If the results of a colon cancer test are normal, is it possible that a person could still have colon cancer? (Yes) 136 (83%) 148 (85%) 110 (96%) 71 (76%)
10. Out of every 100 people about how many will die of colon cancer? (3)* 133 (82%) 53 (30) 73 (64%) 12 (13%)
  1. DA = decision aid; *p < 0.05 for DA vs. no DA.