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Table 2 Meta-regression: the effect of impact factor, COI, Funding category, year, and sample size on effect size

From: The effect of journal impact factor, reporting conflicts, and reporting funding sources, on standardized effect sizes in back pain trials: a systematic review and meta-regression

   Unadjusted   Adjusted b  
   β P 95 % CI for β β P 95 % CI for β
Impact factor        
   0.01 0.81 −0.04 to 0.05 0.02 0.53 −0.03 to 0.06
COI Category a       
  Reported none −0.08 0.73 −0.55 to 0.39 −0.14 0.62 −0.68 to 0.41
  Reported some 0.03 0.94 −0.70 to 0.76 0.02 0.95 −0.75 to 0.80
Funding Category a       
  Reported none 0.19 0.59 −0.49 to 0.86 0.27 0.48 −0.48 to 1.02
  Reported some 0.03 0.89 −0.39 to 0.45 0.05 0.85 −0.43 to 0.52
Publication year        
   −0.05 0.42 −0.16 to 0.07 −0.05 0.44 −0.17 to 0.08
Sample size        
   −0.0003 0.45 −0.001 to 0.0005 −0.0005 0.31 −0.002 to 0.0005
  1. acomparison: none reported
  2. bfor other variables in the model