Progression criteria for the GRRAND-F trial
| Green (Go) | Amber (Amend) | Red (Stop) | |
| Recruitment | 60 participants recruited within 12 months | 40–59 participants recruited within 12 months | <40 participants recruited within 12 months |
| Consent | ≥40% of potentially eligible participants | 20%–39% of potentially eligible participants | <20% of potentially eligible participants |
| GRRAND-F intervention fidelity | >70% participants received protocol-compliant GRRAND-F intervention | 50%–70% received intervention as randomised | <50% received intervention as randomised |
| Contamination | <5% participants in control group received GRRAND-F intervention | 5%–10% participants in control group received GRRAND-F intervention | >10% participants in control group received GRRAND-F intervention |
| Data Completion | <15% missing data at 6 months follow-up | 15%–30% missing data | >30% missing data |
| Retention | <20% attrition at 6 months follow-up | 20%–50% attrition at 6 months follow-up | >50% attrition at 6 months follow-up |
GRRAND-F, Getting Recovery Right After Neck Dissection.