Pre-/post-written knowledge test scores
| Institution | Intervention | Number completing post-test | Mean pre-test score | Mean post-test score | Pre-test versus post-test score: p Value |
| BWH | SE | 62 | 12.3 | 13.5 | <0.001 |
| BWH | SQ | 85 | 11.7 | 12.7 | <0.001 |
| MGH | SE | 58 | 12.2 | 13.6 | <0.001 |
| MGH | None | 70 | 12.3 | 12.2 | 0.62 |