Table 4 Overview of quality ratings for primary studies identified in the systematic review and meta-analysis
From: Prevalence of human papillomavirus in head and neck cancers in European populations: a meta-analysis
Modified MORE ratinga | Modified MORE levels of evidence definition | Number of studiesb |
|---|---|---|
1A (Good) | Fewer than 4 major flaws, plus 0–1 minor flaws | 3 |
1B (Moderate) | Fewer than 4 major flaws, plus 2–3 minor flaws | 17 |
1C (Moderate) | Fewer than 4 major flaws, plus 4 or more minor flaws | 5 |
2A (Poor) | 4 or more major flaws, plus 0–1 minor flaws | 4 |
2B (Poor) | 4 or more major flaws, plus 2–3 minor flaws | 6 |
2C (Poor) | 4 or more major flaws, plus 4 or more minor flaws | 4 |