Stepped wedge study design: 40 surgeons at five sites
| Number of surgeons in the intervention group at each site (number of surgeons added per wave) | ||||||
| Wave | Portland | Newark | Boston | San Francisco | Madison | Total |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 2 (2) | 1 (1) | 2 (2) | 1 (1) | 2 (2) | 8 |
| 2 | 3 (1) | 3 (2) | 3 (1) | 3 (2) | 4 (2) | 16 |
| 3 | 4 (1) | 4 (1) | 5 (2) | 5 (2) | 6 (2) | 24 |
| 4 | 5 (1) | 6 (2) | 6 (1) | 7 (2) | 8 (2) | 32 |
| 5 | 6 (1) | 7 (1) | 8 (2) | 9 (2) | 10 (2) | 40 |
| Total number of patients per site* | 72 | 84 | 96 | 108 | 120 | 480 |
*Half of all patients will have received the question prompt list intervention by the end of wave 5, for a final sample size of 240 patients in each study arm.