Applying Rasch analysis to evaluate measurement equivalence of different administration formats of the Activity Limitation scale of the Cambridge Pulmonary Hypertension Outcome Review (CAMPHOR)

Table 2 Overall fit statistics for the combined dataset

Scale	Item-trait interaction	PSI	Item-person fit residuals				Unidimensionality (95 % Confidence Interval)
	Chi² P-value		Item fit residual		Person fit residual
	Chi² P-value		Mean	SD	Mean	SD
Activity limitation	0.027	0.907	−0.77	0.99	−0.45	1.02	0.064 (0.042–0.085)
Ideal values	>0.003^a	>0.8	0	± 1	0	± 1	<0.05

ISSN: 1477-7525