DEMQOL and DEMQOL-Proxy: a Rasch analysis among those diagnosed with dementia

Hendriks, A. A. Jolijn; Smith, Sarah C.; Black, Nick

doi:10.1186/s12955-019-1216-8

Health and Quality of Life Outcomes

Table 3 Diagnostic statistics for DEMQOL-Proxy (26 items)

From: DEMQOL and DEMQOL-Proxy: a Rasch analysis among those diagnosed with dementia

	Subsample dementia					Full sample
Item	Location	Fit Residual	ChiSq	p	DIF	Location	Fit Residual	ChiSq	p	DIF
2. Worried or anxious	0.456	− 0.264	6.83	0.34	ns	0.637	0.278	3.76	0.93	ns
3. Frustrated	0.502	− 0.052	4.28	0.64	ns	0.574	−0.677	4.27	0.89	ns
5. Sad	− 0.464	− 0.175	13.58	0.03	ns	−0.330	−1.455	7.01	0.64	ns
7. Distressed	−0.532	−1.198	6.24	0.40	ns	−0.425	−2.095	6.48	0.69	ns
9. Irritable	0.000	0.985	14.32	0.03	PWD sex	0.052	0.919	3.07	0.96	PWD sex PWD age Relation
10. Fed-up	0.216	−0.266	13.69	0.03	ns	0.287	−1.249	3.05	0.96	ns
12. Memory in general	0.623	1.094	4.72	0.58	ns	0.664	1.529	6.49	0.69	ns
13. Forgetting that happened long ago	−0.610	2.793	12.90	0.04	ns	−0.467	4.704	19.16	0.02	ns
14. Forgetting that happened recently	1.507	−0.172	5.16	0.52	ns	1.462	0.373	4.66	0.86	ns
15. Forgetting people’s names	0.755	0.478	2.61	0.86	ns	0.684	2.627	8.42	0.49	ns
16. Forgetting where he/she is	−0.754	0.399	9.51	0.15	ns	−0.866	−0.539	5.87	0.75	ns
17. Forgetting what day it is	0.632	1.541	2.52	0.87	ns	0.451	2.045	4.86	0.85	Severity
18. Thoughts being muddled	0.732	−2.251	21.98	0.00	Carer age Relation	0.604	−3.813	25.07	0.00	ns
19. Difficulty making decisions	0.535	−1.790	17.28	0.01	ns	0.458	−3.475	15.15	0.09	ns
20. Making him/herself understood	−0.253	0.748	13.65	0.03	ns	−0.201	2.456	3.60	0.94	ns
21. Keeping him/herself clean	−0.685	2.373	17.93	0.01	ns	−0.744	2.423	7.96	0.54	ns
22. Keeping him/herself looking nice	−0.746	1.470	17.92	0.01	ns	−0.702	2.008	9.74	0.37	ns
23. Getting from the shops	−0.436	−0.795	3.45	0.75	ns	−0.501	−0.922	3.61	0.94	ns
24. Using money to pay	−0.411	−0.573	4.80	0.57	ns	−0.578	−1.365	5.59	0.78	ns
25. Looking after finances	−0.161	1.300	7.54	0.27	ns	−0.304	0.915	9.25	0.41	ns
26. Things taking longer	0.378	−1.195	8.67	0.19	ns	0.402	−2.987	13.39	0.15	ns
27. Getting in touch with people	−0.376	−0.843	7.23	0.30	ns	−0.472	−1.684	6.39	0.70	ns
28. Not having enough company	−0.446	1.012	6.61	0.36	PWD sex PWD age Carer age Relation	−0.352	2.197	7.79	0.56	PWD sex Carer age Relation
29. Not being able to help other people	−0.542	0.012	4.29	0.64	ns	−0.472	1.136	5.80	0.76	ns
30. Not playing a useful part	−0.281	−0.383	7.64	0.27	ns	−0.231	−2.067	8.27	0.51	ns
31. His/her physical health	0.360	0.783	10.10	0.12	ns	0.369	2.762	9.22	0.42	ns

Note. 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 α = 0.01 (Bonferroni-corrected: p < 0.000385)

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ISSN: 1477-7525

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