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Differential item functioning (DIF) of discrimination and severity parameters across age.
| aDIF | bDIF | |||||
|---|---|---|---|---|---|---|
| Item | χ 2 | df | p | χ 2 | df | p |
| 1 | 2.4 | 1 | 0.12 | 5.4 | 4 | 0.25 |
| 2 | 8.1 | 1 | 0.004 | 5.7 | 4 | 0.23 |
| 3 | 0.60 | 1 | 0.45 | 22.8 | 4 | 0.0001 |
| 4 | 2.3 | 1 | 0.13 | 5.7 | 4 | 0.23 |
| 5 | 0.20 | 1 | 0.68 | 3.8 | 4 | 0.44 |
| 6 | 0.00 | 1 | 0.93 | 8.6 | 4 | 0.07 |
Note. DIF = Differential Item Functioning, a = discrimination, b = severity, df = degrees of freedom, χ2 = chi-square value, p = probability value.
