Table 3.
Test of differential item functioning and differential test functioning.
| LRT DIF | df | p | SIDS/STDS | ESSD/ETSSD | |
|---|---|---|---|---|---|
| GENDER (FEMALES REF.) | |||||
| BYSAS3 | 314.083 | 5 | <0.001 | −0.281 | −0.360 |
| BYSAS4 | 228.358 | 5 | <0.001 | 0.193 | 0.335 |
| Impact total score | −0.088 | −0.022 | |||
| AGE GROUP (YOUNG ADULTS REF.) | |||||
| BYSAS3 | 67.289 | 5 | <0.001 | 0.022 | 0.04 |
| BYSAS4 | 54.334 | 5 | <0.001 | −0.018 | −0.05 |
| Impact total score | 0.004 | 0.001 | |||
LRT, likelihood-ratio test; DIF, differential item functioning; SIDS, signed item difference in the sample; STDS, signed test difference in the sample; ESSD, expected score standardized difference; ETSSD, expected test score standardized difference.