DEMQOL and DEMQOL-Proxy: a Rasch analysis

Hendriks, A. A. Jolijn; Smith, Sarah C.; Chrysanthaki, Theopisti; Cano, Stefan J.; Black, Nick

doi:10.1186/s12955-017-0733-6

Health and Quality of Life Outcomes

Table 4 Diagnostic statistics for the smaller item set of DEMQOL (23 items)

From: DEMQOL and DEMQOL-Proxy: a Rasch analysis

Item	Location	Fit Residual	ChiSq	p	DIF	Item residual correlations
Item	Location	Fit Residual	ChiSq	p	DIF	r	Correlation with item
2. Worried or anxious	0.349	0.886	3.54	0.94	ns	0.21, 0.15, 0.08, 0.02	9, 4, 7, 14
4. Frustrated	0.546	0.257	2.66	0.98	ns	0.15, 0.15, 0.14, 0.12, 0.06, 0.06	2, 11, 12, 7, 13
7. Sad	0.080	−0.255	6.58	0.68	ns	0.18, 0.15, 0.14, 0.08, 0.06, 0.01	12, 8, 9, 2, 4, 11
8. Lonely	−0.206	2.222	5.59	0.78	ns	0.40, 0.15, 0.15, 0.04	20, 7, 12, 9
9. Distressed	−0.391	−2.395	7.04	0.63	ns	0.21, 0.14, 0.12, 0.10, 0.05, 0.04	2, 7, 4, 12, 11, 8
11. Irritable	0.007	0.361	1.66	1.00	ns	0.15, 0.14, 0.05, 0.02, 0.01	4, 12, 9, 11, 7
12. Fed-up	0.425	0.361	2.20	0.99	ns	0.18, 0.15, 0.14, 0.14, 0.10, 0.04	7, 8, 4, 11, 9, 13
13. Things you wanted but couldn’t	0.829	4.077	12.51	0.19	ns	0.06, 0.04, 0.02, 0.01	4, 12, 11, 26
14. Forgetting happened recently	0.654	−1.100	4.43	0.88	ns	0.15, 0.12, 0.08, 0.06, 0.06, 0.02	17, 19, 18, 15, 16, 2
15. Forgetting who people are	−0.043	2.511	6.68	0.67	ns	0.11, 0.10, 0.08, 0.07, 0.06, 0.02, 0.02	17, 16, 18, 19, 15, 24, 26
16. Forgetting what day it is	0.135	4.339	11.45	0.25	ns	0.12, 0.10, 0.06, 0.03, 0.02, 0.02	17, 15, 14, 19, 18, 26
17. Thoughts being muddled	0.126	−2.376	8.27	0.51	ns	0.22, 0.15, 0.13, 0.12, 0.11, 0.06, 0.03	19, 14, 18, 16, 15, 24, 27
18. Difficulty making decisions	−0.103	−2.777	8.08	0.53	ns	0.16, 0.13, 0.08, 0.08, 0.02, 0.02	19, 17, 14, 15, 16, 24
19. Poor concentration	0.298	−2.338	6.86	0.65	ns	0.22, 0.16, 0.12, 0.07, 0.03, 0.02	17, 18, 14, 15, 16, 24
20. Not having enough company	−0.415	−0.981	5.01	0.83	ns	0.40, 0.07, 0.07, 0.02	8, 22, 25, 23
21. Get on with people close to you	−0.422	−1.291	5.21	0.82	ns	0.41, 0.11, 0.06, 0.06	22, 24, 23, 25
22. Getting the affection you want	−0.525	0.328	6.63	0.68	ns	0.41, 0.07, 0.07, 0.07, 0.03	21, 20, 23, 25, 24
23. People not listening to you	−0.479	−0.989	5.73	0.77	ns	0.17, 0.07, 0.06, 0.04, 0.02	24, 22, 21, 25, 20
24. Making yourself understood	−0.337	−1.792	4.27	0.89	ns	0.17, 0.11, 0.06, 0.06, 0.03, 0.02, 0.02, 0.02	23, 21, 17, 25, 22, 15, 18, 19
25. Getting help when needed	−0.511	−2.833	5.07	0.83	ns	0.07, 0.07, 0.06, 0.06, 0.04, 0.03, 0.02	20, 22, 21, 24, 23, 28, 26
26. Getting to the toilet in time	−0.267	3.543	17.96	0.04	ns	0.02, 0.02, 0.02, 0.01	15, 16, 25, 13
27. How you feel in yourself	0.016	−4.440	14.24	0.11	ns	0.21, 0.03	28, 17
28. Overall health	0.232	−1.848	6.27	0.71	ns	0.21, 0.03	27, 25

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)

Back to article page

ISSN: 1477-7525

Contact us

Submission enquiries: journalsubmissions@springernature.com