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Table 2 Summary Fit Statistics for Rasch Analyses

From: Rasch analysis of the Hospital Anxiety and Depression Scale (HADS) for use in motor neurone disease

  # of items Item Residual Person Residual Chi Square PSI Unidimensional
t-test (CI %)
Extreme scores (%)
Analysis Name   Mean ± SD Mean ± SD Value p    
HADS-D Initial 7 -0.19 1.51 -0.32 0.77 59.76 < 0.01 0.80 5.17% (2-7%) 0.30%
HADS-D Final 6 -0.15 1.30 -0.30 0.81 39.90 0.20 0.79 4.74% (2.4-8.1%) 15.11%
HADS-A Initial 7 0.14 2.09 -0.30 1.08 52.27 < 0.01 0.92 4.44% (2-7%) 1.70%
HADS-A Final 6 0.00 1.50 -0.36 1.01 34.75 0.07 0.84 5.07% (3-8%) 2.34%
HADS-T Initial 12 0.01 1.45 -0.21 0.90 113.92 < 0.01 0.86 9.90% (6-14%) 1.80%
HADS-T Final 10 -0.02 2.02 -0.47 0.87 10.51 0.23 0.76 7.37% (4-10%) 4.03%
Ideal Values   0 < 1.4* 0 < 1.4   > 0.05 a > 0.85 < 5% (CI < 0.05)  
  1. Key: SD- Standard Deviation, p - Probability, PSI - Person Separation Index, CI - Confidence Interval
  2. *= Can be inflated in the presence of testlets to accommodate local dependence.