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Table 2 Fit of the DASS-Anxiety and HADS-Anxiety items to the Rasch model

From: Depression and anxiety in patients with rheumatoid arthritis: prevalence rates based on a comparison of the Depression, Anxiety and Stress Scale (DASS) and the hospital, Anxiety and Depression Scale (HADS)

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
  1. *Bonferroni adjusted