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Comparison of the types of study designs and the quality rate of included studies
| Quality | Total | ||||||
| High | low | Good | fair | ||||
| Design | Randomized Controlled Studies | Number | 37 | 6 | 0 | 0 | 43 |
| %within design | 100% | 100% | 0.0% | 0.0% | 33.3% | ||
| Non-Randomized studies | Number | 0 | 0 | 21 | 65 | 86 | |
| %within design | 0.0% | 0.0% | 100% | 100% | 66.7% | ||
| Total | Number | 37 | 6 | 21 | 65 | 129 | |
| %within design | 100% | 100% | 100% | 100% | 100.0% | ||
