Table 1 Classification criteria of quality assessment for the included reviews
Quality | Meta-analysis (score) | Systematic review (score) | Outcome |
|---|---|---|---|
Very high | 10–11 | 8–9 | Included for data extraction later |
High | 8–9 | 7 | |
Moderate | 6–7 | 5–6 | |
Low | 1–5 | 1–4 | Excluded |