| Item Fit Residual | Person Fit Residual | Chi Square Interaction | Reliability | |||||
|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Value (DF) | p-value | PSI | N | |
| A. Analysis of the 29 individual items | ||||||||
| UK | −0.232 | 1.043 | −0.233 | 0.680 | 48.932 (29) | 0.012 | 0.919 | 112 |
| Germany | −0.704 | 2.034 | −0.484 | 1.456 | 398 (116) | <0.001 | 0.881 | 263 |
| France | −0.291 | 1.048 | −0.271 | 0.855 | 34.868 (29) | 0.209 | 0.893 | 111 |
| Sweden | −0.264 | 0.910 | −0.273 | 0.728 | 60.886 (29) | <0.001 | 0.892 | 101 |
| Spain | −0.166 | 0.751 | −0.220 | 0.654 | 42.439 (29) | 0.051 | 0.906 | 95 |
| Italy | −0.205 | 1.051 | −0.285 | 0.756 | 88.662 (58) | 0.006 | 0.890 | 125 |
| Pooled | −0.416 | 1.676 | −0.229 | 0.882 | 410.802 (261) | <0.001 | 0.896 | 807 |
| B. Analysis of the 5 subscales (testlets) | ||||||||
| UK | 0.016 | 1.535 | −0.288 | 0.848 | 4.992 (5) | 0.417 | 0.896 | 109 |
| Germany | −0.698 | 2.795 | −0.285 | 0.873 | 61.952 (20) | <0.001 | 0.852 | 263 |
| France | 0.020 | 1.380 | −0.280 | 0.895 | 2.368 (5) | 0.796 | 0.826 | 106 |
| Sweden | −0.136 | 0.793 | −0.253 | 0.819 | 25.665 (44) | 0.988 | 0.813 | 95 |
| Spain | −0.265 | 1.346 | −0.221 | 0.711 | 11.430 (5) | 0.043 | 0.846 | 92 |
| Italy | −0.137 | 1.888 | −0.315 | 0.831 | 4.281 (5) | 0.510 | 0.818 | 125 |
| Pooled* | −0.394 | 2.928 | −0.310 | 0.859 | 63.909 (45) | 0.033 | 0.840 | 536 |
| Pooled-Adj** | −0.420 | 2.724 | −0.310 | 0.862 | 65.579 (54) | 0.134 | 0.841 | 536 |
SD, Standard deviation; DF, Degrees of freedom; PSI, Person separation index reliability; Pooled* excludes Germany dataset; Pooled-Adj** adjusted to account for Italy differential response in the social subscale.