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Table 2 Diagnostic statistics for the original item set of DEMQOL (28 items)

From: DEMQOL and DEMQOL-Proxy: a Rasch analysis

Item Location Fit Residual ChiSq p DIF Item residual correlations
r Correlation with item
1. Cheerful 0.480 0.452 2.08 0.99 ns 0.36, 0.27, 0.21, 0.20, 0.07, 0.04 3, 5, 10, 6, 12, 7
2. Worried or anxious 0.160 0.413 6.07 0.73 ns 0.22, 0.18, 0.10, 0.08, 0.01, 0.01 9, 4, 7, 14, 11, 12
3. Enjoying life 0.322 1.340 4.46 0.88 ns 0.36, 0.30, 0.25, 0.21, 0.06, 0.05, 0.04 1, 10, 6, 5, 12, 8, 7
4. Frustrated 0.352 −0.645 2.86 0.97 ns 0.18, 0.17, 0.15, 0.14, 0.07, 0.07 2, 11, 12, 9, 7, 13
5. Confident 0.578 1.129 5.46 0.79 ns 0.27, 0.21, 0.18, 0.18, 0.02 1, 3, 6, 10, 9
6. Full of energy 1.244 4.014 11.68 0.23 ns 0.53, 0.25, 0.20, 0.18, 0.07, 0.01 10, 3, 1, 5, 13, 12
7. Sad −0.108 −1.561 6.79 0.66 ns 0.17, 0.15, 0.15, 0.10, 0.07, 0.04, 0.04, 0.01 12, 8, 9, 2, 4, 1, 3, 11
8. Lonely −0.380 0.916 3.25 0.95 ns 0.39, 0.15, 0.14, 0.05, 0.04 20, 7, 12, 3, 9
9. Distressed −0.563 −3.047 9.83 0.36 ns 0.22, 0.15, 0.14, 0.10, 0.07, 0.04, 0.02 2, 7, 4, 12, 11, 8, 5
10. Lively 1.340 5.076 17.35 0.04 ns 0.53, 0.30, 0.21, 0.18, 0.02, 0.01 6, 3, 1, 5, 12, 13
11. Irritable −0.177 −0.343 2.89 0.97 ns 0.17, 0.15, 0.07, 0.04, 0.01, 0.01 4, 12, 9, 13, 2, 7
12. Fed-up 0.227 −2.171 6.69 0.67 ns 0.17, 0.15, 0.15, 0.14, 0.10, 0.07, 0.06, 0.04, 0.02, 0.01, 0.01 7, 4, 11, 8, 9, 1, 3, 13, 10, 2, 6
13. Things you wanted but couldn’t 0.633 1.526 7.15 0.62 ns 0.07, 0.07, 0.04, 0.04, 0.01, 0.01 4, 6, 11, 12, 10, 26
14. Forgetting happened recently 0.454 −0.907 3.93 0.92 ns 0.21, 0.18, 0.12, 0.12, 0.11, 0.08, 0.04, 0.04 17, 19, 15, 18, 2, 24, 27
15. Forgetting who people are −0.197 3.299 8.56 0.48 ns 0.17, 0.15, 0.13, 0.13, 0.12, 0.08, 0.06 17, 16, 18, 19, 14, 24, 26
16. Forgetting what day it is −0.034 3.399 7.23 0.61 ns 0.18, 0.15, 0.11, 0.07, 0.05, 0.03 17, 15, 14, 19, 18, 26
17. Thoughts being muddled −0.046 −1.890 4.96 0.84 ns 0.28, 0.21, 0.18, 0.18, 0.17, 0.12, 0.07 19, 14, 16, 18, 15, 24, 27
18. Difficulty making decisions −0.267 −2.999 7.47 0.59 ns 0.20, 0.18, 0.13, 0.12, 0.06, 0.05, 0.02, 0.01, 0.01 19, 17, 15, 14, 24, 16, 21, 23, 25
19. Poor concentration 0.117 −1.781 5.91 0.75 ns 0.28, 0.20, 0.18, 0.13, 0.08, 0.07, 0.05, 0.02, 0.02, 0.01 17, 18, 14, 15, 24, 16, 28, 25, 27, 21
20. Not having enough company −0.572 −0.572 2.85 0.97 ns 0.39, 0.10, 0.09, 0.04, 0.03 8, 22, 25, 23, 21
21. Get on with people close to you −0.567 −0.592 3.87 0.92 ns 0.46, 0.15. 0.10, 0.09, 0.03, 0.02, 0.02, 0.01, 0.01 22, 24, 23, 25, 20, 18, 27, 19, 28
22. Getting the affection you want −0.663 0.959 5.59 0.78 ns 0.46, 0.11, 0.10, 0.10, 0.07, 0.02, 0.02, 0.01 21, 25, 20, 23, 24, 26, 28, 27
23. People not listening to you −0.630 −1.712 4.10 0.90 ns 0.21, 0.10, 0.10, 0.09, 0.04, 0.02, 0.01 24, 21, 22, 25, 20, 28, 18
24. Making yourself understood −0.490 −1.645 4.00 0.91 ns 0.21, 0.15, 0.12, 0.09, 0.08, 0.08, 0.07, 0.06, 0.04, 0.02, 0.01 23, 21, 17, 25, 15, 19, 22, 18, 14, 28, 26
25. Getting help when needed −0.663 −3.235 6.27 0.71 ns 0.11, 0.09, 0.09, 0.09, 0.09, 0.06, 0.04, 0.02, 0.02, 0.01 22, 20, 21, 23, 24, 28, 26, 19, 27, 18
26. Getting to the toilet in time −0.429 2.661 15.41 0.08 ns 0.06, 0.04, 0.03, 0.02, 0.02, 0.02, 0.01, 0.01 15, 25, 16, 6, 22, 28, 13, 24
27. How you feel in yourself −0.170 −5.376 19.98 0.02 ns 0.22, 0.07, 0.04, 0.02, 0.02, 0.02, 0.01 28, 17, 14, 19, 21, 25, 22
28. Overall health 0.047 −2.102 7.97 0.54 ns 0.22, 0.06, 0.05, 0.02, 0.02, 0.02, 0.02, 0.01 27, 25, 19, 22, 23, 24, 26, 21
  1. Fit residuals in bold are outside the acceptable range of +/− 2.5. Location = average item threshold location (logit). ChiSq = chi square value; p = chi square probability. DIF = differential item functioning; ns = non-significant. None of the chi square tests is statistically significant at p < 0.01 (Bonferroni corrected)