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

Table 6 Rasch Analysis of Computer Adaptive Testing item sets

Analysis	Item Sets and samples	*Chi- Square*^a	Df	P	Residual Item	Residual Person	PSI Reliability	% tests >5%	95%LCI	N
					SD	SD
1	Core Set- CAT15 Sample 1	153.0	135	0.138	1.586	0.967	0.87	6.8	4.7	500
2	Core Set- CAT15 Sample 2	172.5	135	0.016	1.711	0.934	0.88	6.6	4.5	500
3	Core Set- CAT15 Sample 3	165.2	135	0.040	1.576	0.880	0.88	5.1	3.0	500
4	Second Set- CAT10 Sample 1	106.6	90	0.112	1.314	0.927	0.84	5.6	3.2	500
5	Second Set- CAT10 Sample 2	114.2	90	0.043	1.694	0.993	0.85	3.6	1.1	500
6	Second Set- CAT10 Sample 3	106.6	90	0.112	1.498	1.021	0.86	5.2	3.0	500
	Ideal Values		>0.05^a		<1.4	<1.4	>0.70	<5.0	<5.0

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