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Meta-regression analyses based on sample size, year of publication and average age of students. No statistically significant effects could be detected.
| Variables | Coefficient | Standard Error | Statistical Significance (p-Value) | Lower 95% CI | Upper 95% CI |
|---|---|---|---|---|---|
| Sample size | 0.0000155 | 0.0005143 | 0.976 | −0.0010808 | 0.0011118 |
| Year of publication | −0.0201732 | 0.0191123 | 0.308 | −0.0609101 | 0.0205636 |
| Average age of students | 0.0375554 | 0.0314417 | 0.260 | −0.032501 | 0.1076119 |
CI: confidence interval.
