Table 4.
BCS-PtDA Intervention, Mean or % (95% CI) | Control, Mean or % (95% CI) | Difference in Mean or % (95% CI) | P Value | |
---|---|---|---|---|
Primary outcomes | ||||
Mammography uptake at 12 months (%) | 19.6 (11.9,27.3) | 20.6 (12.7,28.4) | −1.0 (−12.0, 10.0) | 1.00 |
Total knowledge score (0–5) | 3.8 (3.5, 4.2) | 3.2 (2.8, 3.5) | 0.7 (0.2, 1.2) | 0.01 |
Decisional conflict total score (0–100) | 24.8 (19.5, 30.2) | 32.4 (25.9, 39.0) | −7.6 (−15.9, 0.7) | 0.07 |
Uncertainty | 27.0 (20.4, 33.6) | 31.3 (24.2, 38.4) | −4.3 (−13.8, 5.2) | 0.37 |
Informed | 29.9 (23.2, 36.7) | 35.9 (28.7, 43.2) | −6.0 (−15.7, 3.7) | 0.22 |
Values | 27.0 (21.0, 33.0) | 36.1 (28.9, 43.2) | −9.1 (−18.2, 0.1) | 0.05 |
Support | 20.8 (16.1, 25.5) | 28.3 (21.6, 35.0) | −7.5 (−15.5, 0.4) | 0.06 |
Effective decision making | 23.4 (17.2, 29.6) | 29.2 (22.8, 35.6) | −5.8 (−14.5, 2.9) | 0.19 |
Exploratory outcomes | ||||
Anticipated regret: Delay mammogram (1–7) | 5.4 (4.8, 5.9) | 5.7 (5.3, 6.1) | −0.4 (−1.0, 0.3) | 0.30 |
Anticipated regret: Have mammogram (1–7) | 3.5 (2.9, 4.0) | 3.3 (2.8, 3.8) | 0.2 (−0.6, 0.9) | 0.67 |
Breast cancer worry (1–13) | 5.4 (4.9, 6.0) | 5.0 (4.5, 5.5) | 0.4 (−0.3, 1.1) | 0.28 |
Accuracy of lifetime breast cancer risk perception: Difference between perceived risk and risk determined by the NCI-BCRAT28 | 3.3 (−2.7, 9.3) | 9.3 (2.3, 16.3) | −6.0 (−15.0, 3.1) | 0.20 |
Accuracy of lifetime breast cancer risk perception: Low, medium, or high category (%) | 66.7 (57.5, 75.8) | 54.5 (44.9, 64.2) | 12.1 (−1.2, 25.4) | 0.28 |
Have made a decision about the age at which to start having mammograms (%) | 35.2 (25.9, 44.5) | 26.3 (17.8, 34.9) | 8.9 (−3.7, 21.5) | 0.42 |
Intended age of first mammogram (years) | 42.7 (41.4, 44.0) | 42.4 (41.2, 43.7) | 0.3 (−1.4, 2.0) | 0.75 |
BCS-PtDA, breast cancer screening patient decision-aid; CI, confidence interval; NCI-BCRAT, National Cancer Institute Breast Cancer Risk Assessment Tool.
Difference column reports difference in mean or percentage between study arms and the 95% CI for the difference. Anticipated regret of delay in having a mammogram was in response to the following question: “If I do not have a mammogram in my 40s, and, at a later date, breast cancer is detected, I will regret not having a mammogram.” Anticipated regret of having a mammogram was in response to the question” “If I have a mammogram in my 40s and have unnecessary follow-up tests or procedures, I will regret having mammograms”. The questions were answered on a scale of 1 (strongly disagree) to 7 (strongly agree).