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. 2019 Jan 17;4(1):2381468318812889. doi: 10.1177/2381468318812889

Table 4.

Primary and Exploratory Outcomesa

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.

a

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).