The COPD-SIB: a newly developed disease-specific item bank to measure health-related quality of life in patients with chronic obstructive pulmonary disease

Paap, Muirne C. S.; Lenferink, Lonneke I. M.; Herzog, Nadine; Kroeze, Karel A.; van der Palen, Job

doi:10.1186/s12955-016-0500-0

Table 2 Item properties

From: The COPD-SIB: a newly developed disease-specific item bank to measure health-related quality of life in patients with chronic obstructive pulmonary disease

Item nr	item content (key words)	\( \widehat{\boldsymbol{\alpha}} \)	\( \widehat{{\boldsymbol{\beta}}_1} \)	\( \widehat{{\boldsymbol{\beta}}_2} \)	\( \widehat{{\boldsymbol{\beta}}_3} \)	\( \widehat{{\boldsymbol{\beta}}_4} \)	booklet	flagged in MSA (booklet)
1	air-conditioning	1.06	−2.64	−1.08	0.27		1
2	cold	1.15	−3.1	−0.92	0.32	1.54	1, 2, 3
3	fog	1.4	−2.08	−0.28	0.71	1.83	1
4	humidity	1.39	−2.32	−0.33	0.77	1.64	1
5	wind	1.25	−2.09	−0.38	0.62	1.88	1, 2
9	achieving objectives	1.8	−1.04	0.83	1.38	2.31	1, 2, 3
10	confidence	0.31	−11.43	−5.73	−2.02	7.99	1, 2, 3	1, 2, 3
11	life worth living	0.76	−2.28	0.56	2.2	3.72	2	2
12	asking for help	0.81	−1.78	1.39	2.24	4.16	1, 2, 3	2, 3
13	friendship	−0.59	4.97	2.5	0.57	−3.6	3	3
14	hopelessness	1.69	−2.51	−0.84	0.15	1.34	1
15	fatigue	1.21	−2.27	0.01	0.94	2.7	1, 2, 3
16	living consciously	−0.52	5.69	2.59	0.23	−5.77	2	2
17	accepting help	1.52	−1.05	0.72	1.46	2.29	1
18	life worth living 2	1.32	−2.71	−1.57	−0.38	1.18	3
19	feeling content	0.26	−11.08	−6.75	−3.34	4.8	1	1
20	feeling disappointed	1.35	−2.06	−0.4	0.68	2.47	2
21	fear of being alone	1.69	−1.65	−0.44	0.75		2
22	talking about anxiety	1.1	−1.02	−0.04	1.85		1
23	feeling restricted	2.33	−1.08	0.5	1.16	1.87	3
24	valuing life	0.71	−4.84	−2.22	−0.93	2.64	3	3
25	shunning activities	1.43	−2.28	0.16	0.85	2.26	2
26	avoidance	0.65	−4.09	−0.44	1.17	3.68	1	1
27	fear of suffocation	1.94	−2.18	−0.87	−0.14	1.12	1, 2, 3
28	not accepting restrictions	1.61	−1.32	0.56	1.31	2.41	1
29	dependence	2.08	−2.12	−0.44	0.03	1.2	2
30	talking	1.72	−2.34	−0.65	−0.06	1.22	3
31	bowel problems	0.86	−2.91	−1.18	0.66		1	1
32	friendship 2	1.91	−2.06	−0.75	−0.18	0.94	1, 2, 3
33	alone	1.74	−2.1	−0.75	−0.13	1.18	3
34	fear of being alone 2	1.67	−1.39	−0.63	0.95		2
35	cough hurts	1.41	−1.68	−0.5	0.98		1
36	cough tired	1.79	−1.78	−0.05	0.58	1.43	1
37	breathless talk	1.48	−0.53	0.24	1.69		2
38	breathless bend	1.52	−1.87	0.07	0.72	1.9	3
39	sleep disturbed	1.44	−2.63	−0.75	0.09	1.54	1, 2, 3	2
40	exhausted	2.04	−1.13	0.96	1.43		3
41	cough embarrassing	1.11	−3.35	−1.19	−0.18	1.94	1, 2, 3	3
42	nuisance to others	1.97	−2.21	−0.86	−0.15	1.22	2
43	panic	2.4	−1.86	−0.63	0.04	1.19	2
44	not in control	1.64	−1.41	−0.39	1.59		1
45	frail, invalid	2.33	−1.75	−0.28	0.3	1.28	2
46	effort	2.22	−1.99	−0.56	0.16	1.54	3
47	activities (gardening)	2.34	−1.13	0.11	0.62	1.64	1
48	activities (exercise)	1.55	−0.82	0.92	1.54		3	3
49	activities (dancing)	2.12	−0.88	0.35	0.81	1.8	1
50	frustration	2.21	−2.07	−0.7	0.46	1.2	3
51	being fed up	1.7	−2.41	−1.37	−0.66		1
52	wanting to stay in bed	1.35	−2.14	−0.94	0		3
53	acceptance	−0.32	4.93	2.4	−2.92	−8.17	2	2
54	adapting	0.12	−14.8	−7.53	3.94	20.35	3	3
55	panic 2	1.88	−2.06	−0.88	0.25		2
56	coping	1.08	−3.1	−1.08	0.97		3
57	control	1.39	−1.05	0.74			1
58	cough	0.74	−3.97	−0.92	1.51	3.32	1	1
59	phlegm	0.8	−3.27	−1.43	0.52	2.17	1	1
60	short of breath	1.95	−1.58	−0.22	1.55		1
61	wheezing	0.81	−3.47	−1.51	0.49	2.02	1	1
62	breathless wash	2.28	−1.47	−0.64	0.1	0.66	3
63	breathless walk 1	2.49	−2.07	−1.25	−0.2	0.47	3
64	breathless walk 2	0.98	−1.98	−0.51	1.24	2.31	1, 2, 3	1, 2
65	breathless stairs	0.77	−1.52	−0.19	1.35	2.92	2	2
66	breathless hills	0.04	−17.48	6.54	22.32	36.14	1	1, 2

Note: the reported parameter estimates were calculated using the GRM; the last two columns indicate in which booklet the item was included, and whether or not the item was flagged for removal in the Mokken Scale Analysis (MSA)

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ISSN: 1477-7525

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