Table 2.
Fit of the DASS-Anxiety and HADS-Anxiety items to the Rasch model
| Analysis | Subscale | Item Fit Residual | Person Fit Residual | Chi-Square Interaction | PSI | Uni-dimensionality | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Value | DF | P | % tests | CI | |||
| Anxiety | |||||||||||
| 1 | DASS-A | -0.464 | 1.385 | -0.308 | 0.945 | 48.21 | 28 | 0.010 | 0.863 | 6.63 | 3.3-9.9 |
| 2 | DASS-A | -0.371 | 1.352 | -0.272 | 0.970 | 36.90 | 28 | 0.121 | 0.860 | 5.42 | 2.1-8.7 |
| 3 | DASS-A | -0.219 | 0.790 | -0.267 | 1.016 | 16.48 | 20 | 0.686 | 0.839 | 1.81 | -1.5-5.1 |
| 4 | HADS-A | -0.026 | 1.509 | -0.296 | 1.088 | 23.09 | 14 | 0.588 | 0.838 | 2.41 | -0.1-5.7 |
| Anxiety Combined | |||||||||||
| 5 | D+H-A | -0.301 | 1.418 | -0.287 | 1.067 | 79.648 | 42 | 0.0004 | 0.892 | 8.38 | 5.1-11.7 |
| 6 | D+H-A | -0.152 | 1.084 | -0.296 | 1.107 | 42.17 | 34 | 0.158 | 0.880 | 9.58 | 6.3-12.9 |
| 7 | D+H-A | -0.218 | 1.019 | -0.305 | 1.046 | 37.11 | 32 | 0.245 | 0.871 | 4.79 | 1.5-8.1 |
| Ideal Fit | 0.0 | 1.0 | 0.0 | 1.0 | > 0.05* | > 0.7 | < 5.0 | Lower CI below 5 | |||
*Bonferroni adjusted