The Valued Life Activities Scale (VLAs): linguistic validation, cultural adaptation and psychometric testing in people with rheumatic and musculoskeletal diseases in the UK

Prior, Y.; Tennant, A.; Tyson, S.; Hammond, A.

doi:10.1186/s12891-020-03409-9

Table 5 Rasch Analysis of the Domain Scores

From: The Valued Life Activities Scale (VLAs): linguistic validation, cultural adaptation and psychometric testing in people with rheumatic and musculoskeletal diseases in the UK

	Condition and number of items	*Chi- Square**	Df	P	Residual Item		Residual Person		PSI Reliability	% tests > 5%	95% CI	N of cases/items
					Mean	SD	Mean	SD
	Rheumatoid Arthritis											336
1	Obligatory	31.6	25	0.171	−0.0025	0.7371	−0.3163	0.8669	0.79	1.84	0.0–4.2	5
2.	Committed	41.3	40	0.415	−0.3659	0.8992	− 0.5156	1.2163	0.88	5.0	2.5–7.3	8
3.	Discretionary	59.6	55	0.313	−0.3283	1.1107	−0.3196	0.8450	0.86	4.8	2.4–7.2	11
4	Activities	74.2	65	0.203	−0.3421	1.0915	−0.4057	1.1325	0.91	7.32	5.0–9.7	13
	Ankylosing Spondylitis											165
5	Obligatory	32.5	35	0.590	−0.4068	0.9407	−0.4738	1.0066	0.70	3.75	1.0–8.5	5
6	Committed	22.4	24	0.558	−0.0942	0.9214	−0.3141	1.0133	0.86	5.63	2.2–9.0	8
7	Discretionary	43.2	33	0.110	−0.3089	1.3239	−0.3631	0.8425	0.82	5.63	2.2–9.0	11
8	Activities	98.7	117	0.888	−0.2960	0.8862	−0.3474	1.0455	0.89	4.94	1.6–8.3	13
	Chronic Pain/FM											194
9	Obligatory	13.7	20	0.846	−0.0021	0.6141	−0.4108	1.1276	0.86	4.49	1.1–7.9	5
10	Committed	19.8	24	0.708	−0.2349	1.0388	−0.4173	1.1389	0.90	5.35	2.2–8.5	8
11	Discretionary	45.0	33	0.079	−0.4593	1.6245	−0.3326	0.9164	0.87	4.32	1.2–7.5	11
12	Activities	62.2	39	0.010	−0.2450	0.9657	−0.2855	1.1148	0.94	8.95	5.8–12.0	13
	Chronic HUL											157
13	Obligatory	18.7	15	0.229	−0.3316	1.2499	− 0.3862	0.7203	0.50	2.65	0.0–6.1	5
14	Committed	26.0	24	0.355	−0.3128	1.5619	−0.4211	0.8959	0.88	7.52	3.8–11.2	8
15	Discretionary	32.8	33	0.475	−0.3164	0.9507	−0.4290	1.0548	0.76	3.42	0.0–6.6	11
16	Activities	50.2	39	0.108	−0.1920	1.5876	−0.3047	0.8493	0.88	7.24	3.8–10.7	13
	Osteoarthritis											184
17	Obligatory	31.1	15	0.009	−0.0317	1.2638	−0.2855	0.8517	0.78	2.85	0.0–6.1	5
18	Committed	27.6	24	0.270	−0.3113	0.6352	−0.3043	0.8110	0.87	5.26	1.8–8.7	8
19	Discretionary	49.7	33	0.031	−0.4230	1.2061	−0.3355	0.8260	0.83	5.49	2.2–8.8	11
20	Activities	31.3	39	0.807	−0.3510	0.8760	−0.2667	0.8752	0.91	10.92	7.7–14.2	13
	Systemic Lupus											164
21	Obligatory	15.2	15	0.440	−0.0414	0.5008	−0.3181	0.9331	0.77	3.07	0.0–6.4	5
22	Committed	22.4	24	0.558	−0.3746	0.9971	−0.4169	1.002	0.90	4.91	1.6–8.3	8
23	Discretionary	40.0	33	0.036	−0.3000	1.2608	−0.2669	0.8150	0.84	5.56	2.2–8.9	11
24	Activities	50.1	39	0.110	−0.5035	1.0784	−0.2664	0.9472	0.92	8.59	5.2–11.9	13
	Systemic Sclerosis											170
25	Obligatory	23.4	15	0.075	−0.0035	1.4896	−0.2991	0.8805	0.62	3.00	0.0–6.3	5
26	Committed	25.2	24	0.395	−0.0556	0.8197	−0.3076	0.8682	0.86	3.03	0.0–6.4	8
27	Discretionary	46.2	33	0.063	−0.1914	1.4057	−0.2351	0.7523	0.80	2.45	−0.09-5.8	11
28	Activities	41.6	39	0.358	−0.1652	1.1150	−0.3109	0.9900	0.87	4.85	1.5–8.2	13
	Primary Sjogren’s											171
29	Obligatory	12.2	10	0.273	0.0650	1.2408	−0.1897	0.9149	0.55	1.81	−1.5-5.1	5
30	Committed	31.8	24	0.131	−0.1624	0.9641	−0.4212	0.8971	0.85	2.45	−0.9-5.8	8
31	Discretionary	4.1	33	0.094	−0.1784	1.2859	−0.3196	0.8102	0.74	0.61	−2.7-3.9	11
32	Activities	46.6	39	0.189	−0.4608	1.1457	−0.4803	1.0434	0.86	3.03	0.0–6.4	13
	Ideal Values			> 0.05		< 1.4		< 1.4	> 0.70	< 5.0	LCI < 5.0

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