Database | N | Mean | Standard deviation | Minimum | Maximum |
---|---|---|---|---|---|
PDQ-Evidence | 83 | 1.65 | 0.63 | 1 | 3 |
PubMed | 65 | 2.18 | 0.81 | 1 | 4 |
Cochrane Library | 57 | 2.04 | 0.63 | 1 | 3 |
Google Scholar | 21 | 1.62 | 0.59 | 1 | 3 |
Health Systems Evidence | 10 | 2.40 | 0.97 | 1 | 4 |
Trip | 10 | 1.50 | 0.71 | 1 | 3 |
EVIPNet | 3 | 3 | 1 | 22 | 4 |