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Table 2 Fit of PGWBI to the Rasch model

From: Construct validity of the psychological general well being index (PGWBI) in a sample of patients undergoing treatment for stress-related exhaustion: a rasch analysis

   Item residual Person residual Chi square PSI Unidimensional test%(CI)
Analysis name # of items Mean ±SD Mean ±SD Value   p  
1. Pos Well Being 4 -0.24 0.96 -0.42 0.84 27.9 0.68 0.81 5.59 (3.8-11.2)
2. General Health 3 0.42 0.92 -0.40 0.95 12.6 0.18 0.59 1.12 (-0.2-4.3)
3. Depressed Mood 3 -0.06 0.67 -0.40 0.89 21.4 0.77 0.88 5.03 (1.8-8.2)
4. Self Control 3 0.21 0.34 -0.30 0.77 9.5 0.40 0.65 2.79 (0.0-6.0)
5. Anxiety 5 0.28 1.74 -0.41 1.15 51.8 <0.00 0.81 7.26 (4.1-10.5)
6. Anxiety 3 -0.10 1.66 -0.58 1.19 15.8 0.08 0.72 3.37 (0.2-6.5)
7. Vitality 4 0.26 1.39 -0.38 0.87 9.89 0.62 0.85 3.91 (0.7-7.1)
8. Time 1 22 0.58 2.39 -0.15 1.55 158.5 < 0.01 0.92 25.7 (22.5-28.9)
9. Six testlet 6 (22) 0.25 1.78 -0.35 1.15 18.3 0.11 0.85 7.8 (4.6-11.0)
10. Time 2 22 0.30 3.01 -0.13 1.59 399.2 <0.01 0.94 21.2 (18.0-24.4)
11. Six testlet 2 3 (22) 0.21 2.23 -0.36 1.21 22.5 0.03 0.89 8.9 (5.7-12.1)
12. Five testlet 2 5 (22) 0.12 2.11 -0.42 1.23 20.1 0.17 0.88 7.3 (4.1-10.5)
13. Pooled 2 (22) 0.14 0.92 -0.64 0.99 3.8 0.95 0.86 4.9 (2.6-7.1)
Ideal Values   0.0 <1.4 a 0.0 <1.4   >0.05 b >0.85 (LCI <5% )
  1. a) May be higher when unequal length testlets present b) Bonferroni adjusted.