Table 1. Overview of mean reliabilities with confidence interval.
| Method | Publication | Levels | N | Mean | CL95% | CU95% |
| a) ICC, r | ||||||
| Fixed effects | van Houwelingen, Arends and Stijnen [77] | 2 | 44 | .234 | .222 | .246 |
| Random effects | van Houwelingen, Arends and Stijnen [77] | 2 | 44 | .341 | .289 | .392 |
| van Houwelingen, Arends and Stijnen [77] | 3 | 44 | .340 | .283 | .396 | |
| b) Cohen's Kappa | Hunter & Schmidt [107], [108], [109] | 2 | 26 | .17 | .13 | .21 |
Notes: To obtain the reliability estimates (ICC/r2) shown in this table, correlations (r) were squared. N = number of coefficients included. Levels = number of levels in the meta-analysis.