Table 2 Meta-regression of study and patient factors
| 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 |