Fig. 8From: Item response theory and differential test functioning analysis of the HBSC-Symptom-Checklist across 46 countriesDifferential test functioning for the GRM after alignment. Notes. The curves show differences in expected test scores (with 99% CI) dependent on the level of the latent variable (GB_Eng as reference group), sDRF = compensatory differential response functioning statistic with 99% CI, uDRF = non-compensatory differential response functioning statistic with 99% CI. The abbreviations of the country names can be found in Table 1Back to article page