Table 2 Changes in knowledge and intent to initiate lung cancer screening before and after viewing the decision aid (n = 50)

 Who do you think is more likely to be diagnosed with lung cancer?

 People who are screened for lung cancer.^a

 People who are NOT screened for lung cancer

26% (8%, 44%), p < 0.001

 ALL lung cancers will eventually cause illness and death if they are not found and treated.

 True/False^a/Don’t Know

48% (31%, 65%), p < 0.001

 When screening finds lung cancer, doctors can tell whether the cancer will ever cause harm.

 True/False^a/Don’t Know

46% (62%, 30%), p < 0.001

 Even lung cancers that may not cause any health problems are likely to be treated.

 True^a/False/Don’t Know

14% (4%, 32%), p = 0.09

 Screening tests lead some people to get cancer treatments that they do not need.

 True^a/False/Don’t Know

58% (40%, 76%), p < 0.001

 Screening tests find harmless lung cancers about as often as they prevent death from lung cancer.

 True^a/False/Don’t Know

28% (9%, 47%), p < 0.001

 Which of these 2 statements best describes over-detection from screening?

 Screening finds a cancer that would never have caused trouble^a

 Screening finds an abnormality but extra tests show it is not cancer

12% (3%, 27%), p = 0.08

 An abnormal result from lung cancer screening always means the person has lung cancer.

 True/False^a/Don’t Know

22% (5%, 39%), p < 0.001

 For the next question, please think about 1000 current and former smokers who are getting screened every year for lung cancer. Out of 1000 people who get a chest CT scan, about how many will have their lives prolonged?

 0

 1-5^a

 6-10^a

 11-30^a

 31–100

 101–200

 201–400

 401–700

 701–1000

 Don’t Know

30% (12%, 48%), p < 0.001

Average Knowledge Score (0–9 points)

2.8 (2.1,3.6), p < 0.001