Table 2.
Linear regression results of PRISMA statement and AMSTAR-2
| Category | Number of "yes" in PRISMA/AMSTAR-2 rating | Univariate analysis | Multivariate analysis | ||
|---|---|---|---|---|---|
| Coefficient (95% CI) | Coefficient (95% CI) | Adjusted R2 | VIF | ||
| IF | Number of "yes" in PRISMA | -0.050,0.135 | |||
| AMSTAR-2 rating | -0.047,0.005 | ||||
| Number of authors | Number of "yes" in PRISMA | -0.057,0.118 | |||
| AMSTAR-2 rating | -0.035,0.015 | ||||
| Number of institutions | Number of "yes" in PRISMA | -0.076,0.205 | |||
| AMSTAR-2 rating | -0.038,0.043 | ||||
| Number of included studies | Number of "yes" in PRISMA | -0.018,0.000 | -0.019,-0.001 | 0.142a | 1.013 |
| AMSTAR-2 rating | -0.006,0.000 | -0.006,-0.001 | 0.192b | 1.001 | |
| International collaborations | Number of "yes" in PRISMA | -0.141,4.031 | |||
| AMSTAR-2 rating | -0.447,0.783 | ||||
| Funding | Number of "yes" in PRISMA | 0.710,5.842 | 1.105,6.095 | 0.142 a | 1.013 |
| AMSTAR-2 | -0.272,1.259 | ||||
| Registration | Number of "yes" in PRISMA | -2.395,2.997 | |||
| AMSTAR-2 rating | 0.386,1.832 | 0.448,1.832 | 0.192 b | 1.001 | |
| PRISMA statement | Number of "yes" in PRISMA | -0.857,4.166 | |||
| AMSTAR-2 rating | -0.843,0.620 | ||||
CI Confidence interval, VIF Variance inflation factor
Bolded parts indicate that they are statistically different
a Number of included studies" and "Funding" explained for 14.2% of the variation in "Number of ' yes' in PRISMA"
b Number of included studies" and " Registration" explained for 19.2% of the variation in "AMSTAR-2 rating"