Table 1 Anticipated power to detect patient and stakeholder-important outcomes on completion of the trial
Outcome (n = 884) | Usual Care* | Decision Aid* | Difference | Power |
|---|---|---|---|---|
Patient knowledge | 44% (23.3) | 60% (20.9) | 16% (9.5%, 22.5%) | 99% |
Patient engagement in the decision-making process (n = 221) | 7.0 (5.5) | 26.3 (8.2) | 19.3 (18.4, 20.2) | 99% |
Decisional conflict†| 35.9 (18.9) | 22.3 (21.1) | 13.6 (11.0, 16.2) | 99% |
Trust in the physician | 79.3 (19.9) | 83.4 (19.8) | 4.1 (1.5, 6.7) | 86% |
Patient satisfaction with the decision made (% agree or strongly agree they are satisfied) | 69.7 (25.6) | 80 (25.6) | 10.3 (4.6%, 16.0%) | 99% |
Safety (major adverse cardiovascular events)‡ | 0% | 0% | 0% (−−) | 78% |
Proportion of patients admitted for cardiac testing | 77% | 67% | 10% (4.1, 15.9) | 90% |
Healthcare utilization | 8.3 (0.8) | 7.0 (0.7) | 1.3 (1.2, 1.4) | 99% |