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Table 2 Meta-regression of study and patient factors

From: A meta-analysis of N-acetylcysteine in contrast-induced nephrotoxicity: unsupervised clustering to resolve heterogeneity

  Characteristic r* p-value
Study-related Publication date (months after first) 0.36 0.1
  Study size (number of patients) 0.14 0.54
  Jadad score (1–5) 0.07 0.75
  Total NAC dose (mg) -0.26 0.25
Patient-related Age (years) -0.13 0.56
  Baseline Creatinine (mg/dl) -0.01 0.96
  Diabetes mellitus (%) -0.23 0.31
  Female (%) 0.1 0.72
  Contrast volume (ml) -0.27 0.24
  CIN event rate in control group (%) 0.21 0.35
  1. *A negative correlation coefficient implies more benefit as the tested independent variable increases.