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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
  1. aTA Shamliyan, RL Kane, MT Ansari, G Raman, ND Berkman, M Grant, G Janes, M Maglione, D Moher and M Nasser [72].
  2. bThe count of publications in this table includes primary studies.