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Crude summary data on the quality of 26 papers assessed using the checklist.
| Randomized Studies | Non-Randomized Studies | |||
|---|---|---|---|---|
| Mean | Range | Mean | Range | |
| Reporting | 8.9 | 6–10 | 6.9 | 5–9 |
| External validity | 2.6 | 1–3 | 2.0 | 0–3 |
| Bias | 6.8 | 5–7 | 4.8 | 4–5 |
| Confounding | 4.5 | 1–6 | 0.9 | 0–2 |
