Table 1 Frequencies of the qualtiy criteria of the included Systematic Reviews (from PRISMA and AMSTAR)
PRISMA | Yes | Unclear | No | |||
|---|---|---|---|---|---|---|
SR in title | 47 | 87.0% | 1 | 1.9% | 6 | 11.1% |
Rationale | 51 | 94.4% | 2 | 3.7% | 1 | 1.9% |
Question | 33 | 61.1% | 1 | 1.9% | 20 | 37.0% |
Protocol | 14 | 25.9% | 8 | 14.8% | 32 | 59.3% |
Sources | 53 | 98.1% | 0 | 0.0% | 1 | 1.9% |
Search | 39 | 72.2% | 0 | 0.0% | 15 | 27.8% |
Selection | 28 | 51.9% | 3 | 5.6% | 23 | 42.6% |
Data extraction | 30 | 55.6% | 1 | 1.9% | 23 | 42.6% |
Researchers contacted | 19 | 35.2% | 8 | 14.8% | 27 | 50.0% |
Data variables | 27 | 50.0% | 3 | 5.6% | 24 | 44.4% |
Risk of bias method | 51 | 94.4% | 0 | 0.0% | 3 | 5.6% |
Type of measures | 35 | 64.8% | 2 | 3.7% | 17 | 31.5% |
Synthesis methods | 30 | 55.6% | 0 | 0.0% | 24 | 44.4% |
Limitations | 33 | 61.1% | 0 | 0.0% | 21 | 38.9% |
Funding | 36 | 66.7% | 1 | 1.9% | 17 | 31.5% |
N screened or relevant | 49 | 90.7% | 0 | 0.0% | 5 | 9.3% |
N included | 53 | 98.1% | 0 | 0.0% | 1 | 1.9% |
Sources grey | 19 | 35.2% | 9 | 16.7% | 26 | 48.1% |
List included | 43 | 79.6% | 2 | 3.7% | 9 | 16.7% |
List excluded | 8 | 14.8% | 2 | 3.7% | 44 | 81.5% |
Conflict of Interest | 29 | 53.7% | 2 | 3.7% | 23 | 42.6% |