Table 5 The result of DIF detection based on parametric and non-parametric tests
Dimension | Item | Hybrid IRT- Logistic Regression | Mantel-Haenszel | |||
|---|---|---|---|---|---|---|
\( {x}_{12}^2 \) | \( {x}_{13}^2 \) | \( {x}_{23}^2 \) | χ2 | p-value | ||
Dimension 1: Agitation | GDS6 | 0.000 | 0.000 | 0.001 | 68.39 | 0.000 |
GDS8 | 0.979 | 0.917 | 0.677 | 1.20 | 0.274 | |
GDS13 | 0.000 | 0.000 | 0.106 | 21.43 | 0.000 | |
GDS18 | 0.675 | 0.762 | 0.544 | 1.60 | 0.206 | |
GDS29 | 0.000 | 0.000 | 0.334 | 41.26 | 0.000 | |
Dimension 2: Cognitive concerns | GDS14 | 0.000 | 0.000 | 0.000 | 88.91 | 0.000 |
GDS26 | 0.016 | 0.000 | 0.000 | 7.87 | 0.005 | |
GDS30 | 0.715 | 0.799 | 0.574 | 0.97 | 0.324 | |
GDS20 | 0.000 | 0.000 | 0.001 | 41.82 | 0.000 | |
Dimension 3: Dysphoria | GDS1 | 0.992 | 0.866 | 0.592 | 0.18 | 0.674 |
GDS2 | 0.000 | 0.000 | 0.707 | 11.32 | 0.001 | |
GDS3 | 0.035 | 0.087 | 0.517 | 12.55 | 0.000 | |
GDS4 | 0.309 | 0.509 | 0.574 | 3.92 | 0.048 | |
GDS10 | 0.002 | 0.000 | 0.014 | 13.57 | 0.000 | |
GDS11 | 0.225 | 0.479 | 0.969 | 0.62 | 0.432 | |
GDS16 | 0.133 | 0.257 | 0.498 | 0.08 | 0.775 | |
GDS23 | 0.000 | 0.000 | 0.109 | 21.23 | 0.000 | |
GDS24 | 0.025 | 0.026 | 0.136 | 6.37 | 0.012 | |
GDS25 | 0.083 | 0.000 | 0.000 | 1.89 | 0.169 | |
Dimension 4: Vigor/withdrawal | GDS5 | 0.000 | 0.000 | 0.474 | 29.54 | 0.000 |
GDS12 | 0.000 | 0.000 | 0.750 | 28.89 | 0.000 | |
GDS15 | 0.631 | 0.000 | 0.000 | 0.21 | 0.648 | |
GDS17 | 0.062 | 0.000 | 0.000 | 2.57 | 0.109 | |
GDS19 | 0.292 | 0.001 | 0.000 | 3.22 | 0.073 | |
GDS20 | 0.000 | 0.000 | 0.048 | 30.28 | 0.000 | |
GDS21 | 0.000 | 0.000 | 0.091 | 6.49 | 0.011 | |
GDS22 | 0.104 | 0.169 | 0.339 | 1.31 | 0.253 | |
GDS27 | 0.219 | 0.049 | 0.033 | 0.73 | 0.392 | |
GDS28 | 0.000 | 0.000 | 0.002 | 13.11 | 0.000 | |