From: A comparative evaluation of PDQ-Evidence
Database
N
Mean
SD
Minimum
Maximum
PDQ-Evidence
83
1.51
0.67
1
4
PubMed
65
2.17
0.84
Cochrane Library
57
1.91
0.63
3
Google Scholar
21
2.00
1.00
Health Systems Evidence
10
2.20
1.03
Trip
1.70
EVIPNet