Functioning of young patients with cerebral palsy: Rasch analysis of the pediatric evaluation of disability inventory computer adaptive test daily activity and mobility

Table 2 Reliability indexes (non-extreme persons and items) and homogeneity

PEDI-CAT domain	Person index		Item index		Log-likelihood
PEDI-CAT domain	SEP	REL	SEP	REL	X² (df)	p value
Daily activity	4.78	0.96	5.86	0.97	4556.49 (4558)	0.50
Mobility	6.94	0.98	7.61	0.98	2142.17 (2126)	0.39

SEP separation, REL reliability. Numbers represent reproducibility (reliability indexes) and dispersion (separation indexes) of individuals and items along the continua. Reference values for person and item: separation indexes > 2 and reliability indexes > 0.8. X²: Chi-square, df degrees of freedom. Reference values for log-likelihood: p > 0.01

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