Table 3 Study progression criteria
| Proceed | Proceed with changes | Do not proceed without major changes | |
|---|---|---|---|
| Compliance with the intervention | ≥ 60% | 40–59% | < 40% |
| Retention of participants in trial | ≥ 75% | 50–74% | < 50% |
| Completion of primary outcome data in participants not lost-to-follow-up | ≥ 90% | 80–89% | < 80% |