Factors Associated with Methodological Quality
No significant relationships between mean AMSTAR score and number of
citations (Figure 3A; p=0.0875, r=0.25; 95% CI, -0.04 to 0.50), journal
impact factor (Figure 3B; p=0.2959, r=-0.15; 95% CI, -0.42 to 0.14), or
publication year (Figure 3C; p=0.5827, r=0.08; 95% CI, -0.20 to 0.36)
were found. Cochrane studies on average scored higher than non-Cochrane
studies (p=0.01) (Figure 3D). No significant differences (p=0.34) were
found between the AMSTAR scores of Government and philanthropic, or
institution-funded studies (Figure 3E).