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Table 3 Diagnostic statistics for the original item set of DEMQOL-Proxy (31 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 0.154 −0.545 6.31 0.71 ns 0.42, 0.36, 0.28, 0.27, 0.22, 0.20, 0.11, 0.07 8, 6, 4, 11, 5, 10, 9, 7
2. Worried or anxious 0.469 −0.437 8.04 0.53 ns 0.34, 0.32, 0.28, 0.21, 0.17, 0.12, 0.04 3, 7, 5, 10, 9, 12, 6
3. Frustrated 0.410 −1.346 7.24 0.61 ns 0.34, 0.34, 0.31, 0.29, 0.25, 0.08, 0.05 2, 9, 10, 7, 5, 12, 6
4. Full of energy 1.439 3.763 19.31 0.02 ns 0.66, 0.28, 0.26, 0.19, 0.07, 0.06 8, 4, 11, 6, 31, 10
5. Sad --0.485 −2.889 15.30 0.08 ns 0.39, 0.31, 0.28, 0.25, 0.22, 0.17, 0.15, 0.09, 0.06, 0.02 10, 7, 2, 3, 1, 9, 6, 11, 8, 28
6. Content 0.332 0.831 6.14 0.73 ns 0.36, 0.26, 0.23, 0.19, 0.19, 0.15, 0.07, 0.05, 0.04 1, 8, 11, 4, 10, 5, 9, 3, 2
7. Distressed --0.564 −3.147 14.07 0.12 ns 0.32, 0.31, 0.29, 0.25, 0.23, 0.09, 0.07, 0.01 2, 5, 3, 10, 9, 6, 1, 16
8. Lively 1.299 4.383 23.41 0.01 ns 0.66, 0.42, 0.37, 0.26, 0.11, 0.06, 0.02 4, 1, 11, 6, 10, 5, 31
9. Irritable --0.094 0.040 4.74 0.86 PWD sex
PWD age
Relation
0.34, 0.30, 0.23, 0.17, 0.17, 0.11, 0.07 3, 10, 7, 2, 5, 1, 6
10. Fed-up 0.126 −3.633 16.44 0.06 ns 0.39, 0.31, 0.30, 0.25, 0.21, 0.20, 0.19, 0.11, 0.10, 0.06, 0.03 5, 3, 9, 7, 2, 1, 6, 8, 11, 4, 28
11. Things to look forward to 0.470 4.110 26.13 0.00 ns 0.37, 0.27, 0.26, 0.23, 0.05, 0.01 8, 1, 4, 6, 28, 17
12. Memory in general 0.503 1.733 7.16 0.62 ns 0.18, 0.12, 0.09, 0.08, 0.04, 0.04, 0.02, 0.01 14, 2, 15, 3, 18, 31, 13, 29
13. Forgetting happened long ago −0.587 4.393 19.07 0.02 ns 0.16, 0.06, 0.05, 0.04, 0.03, 0.02, 0.02, 0.02 15, 16, 27, 25, 14, 12, 20, 24
14. Forgetting happened recently 1.257 0.481 1.98 0.99 ns 0.30, 0.26, 0.26, 0.18, 0.18, 0.06, 0.03, 0.03, 0.01 15, 17, 18, 12, 19, 16, 13, 27, 26
15. Forgetting people’s names 0.523 2.785 10.10 0.34 ns 0.30, 0.17, 0.16, 0.12, 0.09, 0.09, 0.07, 0.07, 0.02, 0.01 14, 17, 13, 16, 12, 18, 19, 20, 27, 25
16. Forgetting where he/she is −0.984 −1.341 5.45 0.79 ns 0.24, 0.18, 0.12, 0.09, 0.06, 0.06, 0.05, 0.03, 0.01 17, 18, 12, 19, 13, 14, 20, 23, 7
17. Forgetting what day it is 0.301 1.954 5.52 0.79 Severity 0.30, 0.26, 0.24, 0.17, 0.17, 0.04, 0.01 18, 14, 16, 15, 19, 23, 11
18. Thoughts being muddled 0.437 −3.998 23.64 0.00 ns 0.39, 0.30, 0.26, 0.18, 0.17, 0.09, 0.04, 0.03 19, 17, 14, 16, 20, 15, 12, 26
19. Difficulty making decisions 0.299 −3.794 16.87 0.05 ns 0.39, 0.19, 0.18, 0.17, 0.09, 0.09, 0.07, 0.03, 0.02 18, 20, 14, 17, 16, 26, 15, 27, 25
20. Making him/herself understood −0.334 3.519 0.54 1.00 ns 0.19, 0.17, 0.07, 0.05, 0.05, 0.02, 0.02, 0.01, 0.01 19, 18, 15, 16, 27, 13, 25, 21, 24
21. Keeping him/herself clean −0.860 1.746 7.57 0.58 ns 0.64, 0.13, 0.09, 0.05, 0.04, 0.03, 0.01, 0.01 22, 23, 24, 31, 29, 26, 20, 30
22. Keeping him/herself looking nice −0.814 2.051 6.38 0.70 ns 0.64, 0.15, 0.08, 0.05, 0.05, 0.02, 0.01, 0.01 21, 23, 29, 24, 31, 30, 25, 27
23. Getting from the shops −0.615 −1.029 2.99 0.96 ns 0.26, 0.15, 0.13, 0.11, 0.09, 0.06, 0.04, 0.03 24, 22, 21, 25, 27, 26, 17, 16
24. Using money to pay −0.688 −0.991 5.64 0.78 ns 0.49, 0.26, 0.11, 0.09, 0.08, 0.05, 0.02, 0.01 25, 23, 27, 21, 26, 22, 13, 20
25. Looking after finances −0.418 1.519 9.45 0.40 ns 0.49, 0.17, 0.11, 0.05, 0.04, 0.02, 0.02, 0.01, 0.01 24, 27, 23, 26, 13, 19, 20, 15, 22
26. Things taking longer 0.246 −3.239 12.97 0.16 ns 0.15, 0.15, 0.09, 0.09, 0.08, 0.08, 0.06, 0.05, 0.03, 0.03, 0.01 27, 30, 19, 29, 24, 31, 23, 25, 18, 21, 14
27. Getting in touch with people −0.593 −1.469 5.18 0.82 ns 0.17, 0.15, 0.14, 0.11, 0.10, 0.09, 0.06, 0.05, 0.05, 0.03, 0.03, 0.02, 0.01 25, 26, 29, 24, 28, 23, 30, 13, 20, 14, 19, 15, 22
28. Not having enough company −0.487 0.784 5.75 0.76 PWD sex
Carer age
Relation
0.10, 0.05, 0.03, 0.02 27, 11, 10, 5
29. Not able help other people −0.593 0.668 3.07 0.96 ns 0.41, 0.14, 0.09, 0.09, 0.08, 0.04, 0.01 30, 27, 26, 28, 22, 21, 12
30. Not playing useful part −0.368 −3.119 10.01 0.35 ns 0.41, 0.15, 0.11, 0.06, 0.02, 0.01 29, 26, 28, 27, 22, 21
31. His/her physical health 0.218 0.854 2.33 0.99 ns 0.18, 0.14, 0.08, 0.07, 0.05, 0.05, 0.04, 0.02 30, 29, 26, 4, 21, 22, 12, 8
  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)