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Table 3 Association between quality of methodology reporting, structure formats and potential confounders - Univariable and multivariable generalised estimation equation (GEE) derived coefficients (B) and 95% confidence intervals, with overall quality score (OQS) as the dependent variable and journal as the grouping factor (n = 341 abstracts from 33 journals)

From: Structure formats of randomised controlled trial abstracts: a cross-sectional analysis of their current usage and association with methodology reporting

   Univariable Multivariableb
Explanatory variables Category/unit B 95% CI P value QICCa B 95% CI P value
Structure format IMRaD Reference     Reference   
HS 0.66 (0.15, 1.16) 0.011 620.2 0.54 (0.06, 1.03) 0.028
Journal type General Reference       
  Specialty −0.30 (−0.86, 0.25) 0.285 650.3    
Continent     0.838 651.0    
  Europe Reference       
  North America −0.16 (−0.55, 0.22) 0.408     
  Asia −0.28 (−0.86, 0.31) 0.353     
  Oceania 0.20 (−0.63, 1.03) 0.638     
  Others −0.23 (−1.29, 0.84) 0.677     
Publication year 1 year 0.09 (−0.06, 0.25) 0.224 652.7    
No. of centres Single centre Reference     Reference   
  Multi-centre 0.42 (0.16, 0.68) 0.002 623.9 0.36 (0.08, 0.64) 0.013
Funded No Reference     Reference   
  Yes 0.69 (0.39, 0.99) <0.001 625.5 0.57 (0.24, 0.90) 0.001
  1. IMRaD Introduction, methods, results, and discussion format, HS Highly structured format
  2. aQICC, Corrected quasi likelihood under independence model criterion
  3. bFor the final multivariable model, intercept = 3.437, QICC = 580.3