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Table 3 Multivariable regression analysis of potential factors for reporting quality of each domain

From: Improving the quality of reporting of systematic reviews of dose-response meta-analyses: a cross-sectional survey

Influential factors Reporting domains and estimated regression coefficients
Title and Introduction P-value Methods P-value Results P-value Conclusion P-value
No. of authors
  ≤ 4 Reference   Reference   Reference   Reference  
 5 ~  6 0.02 (−0.03, 0.06) 0.457 0.50 (0.20, 0.80) 0.001 0.17 (0.03, 0.31) 0.018 0.20 (0.05, 0.36) 0.011
 7~  8 −0.01 (− 0.05, 0.04) 0.819 0.57 (0.22, 0.92) 0.002 0.09 (−0.05, 0.23) 0.208 0.10 (−0.10, 0.30) 0.315
  > 8 0.04 (−0.02, 0.09) 0.179 0.64 (0.23, 1.04) 0.002 0.10 (−0.07, 0.27) 0.253 0.33 (0.12, 0.55) 0.003
Year of publication
 2011 Reference   Reference   Reference   Reference  
 2012 0.01 (−0.00, 0.02) 0.198 0.37 (−0.30, 1.04) 0.279 0.36 (0.05, 0.68) 0.025 −0.29 (− 0.69, 0.11) 0.157
 2013 0.00 (−0.01, 0.01) 0.819 0.68 (−0.04, 1.41) 0.062 0.45 (0.15, 0.75) 0.004 −0.15 (− 0.49, 0.19) 0.387
 2014 0.01 (0.00, 0.02) 0.048 0.49 (0.06, 1.33) 0.142 0.54 (0.23, 0.85) 0.001 −0.19 (− 0.55, 0.18) 0.318
 2015 0.00 (−0.02, 0.02) 0.964 0.69 (0.06, 1.33) 0.032 0.65 (0.34, 0.96) <  0.001 −0.04 (− 0.40, 0.31) 0.818
 2016 −0.00 (− 0.02, 0.01) 0.709 1.03 (0.41, 1.64) 0.001 0.81 (0.53, 1.08) <  0.001 0.10 (−0.24, 0.45) 0.552
 2017 (up to July-31) 0.00 (−0.02, 0.01) 0.914 1.50 (0.82, 2.18) <  0.001 0.83 (0.53, 1.13) <  0.001 −0.16 (− 0.53, 0.21) 0.399
Use of reporting guidance
 No Reference   Reference   Reference   Reference  
 Yes −0.00 (−0.02, 0.04) 0.083 0.57 (0.32, 0.82) <  0.001 0.25 (0.13, 0.38) <  0.001 0.17 (0.03, 0.32) 0.020
Region
 European Reference   Reference   Reference   Reference  
 Asia Pacific −0.03 (−0.06, − 0.001) 0.042 − 0.45 (− 0.77, − 0.13) 0.006 0.24 (0.07, 0.41) 0.005 −0.10 (− 0.26, 0.06) 0.230
 America 0.00 (−0.06, 0.01) 0.637 −0.14 (− 0.93, 0.65) 0.720 −0.08 (− 0.36, 0.19) 0.552 −0.14 (− 0.39, 0.12) 0.302
Methodologist involved
 No Reference   Reference   Reference   Reference  
 Yes −0.00 (−0.02, 0.02) 0.859 0.32 (0.06, 0.58) 0.015 0.10 (−0.02, 0.22) 0.095 0.40 (0.24, 0.56) <  0.001
  1. Note: The correlations of the four domains were small, ranges from 0.003 to 0.357