Reliability and validity of the Portuguese version of the Stroke Impact Scale 2.0 (SIS 2.0)
To test the reliability and validity of the Portuguese version of the Stroke Impact Scale 2.0 (SIS 2.0). Two samples (N = 448 and N = 50) of stroke patients attending physical therapy were evaluated. The Portuguese versions of the SIS 2.0 and Chedoke-McMaster Stroke Assessment (CMSA), and a set of individual patient characteristics were the measures used. Reliability was good with Cronbach’s alpha coefficients ranging from 0.83 to 0.96, and intraclass correlation coefficients (ICC) between 0.70 and 0.95 for the SIS 2.0 domains. Construct validity was supported by 6 predefined hypotheses involving expected correlations between SIS 2.0 domains, CMSA dimensions and age. An additional predefined hypothesis was also confirmed, with subjects without complications during hospitalization obtaining significantly higher scores in 7 of the 8 SIS 2.0 domains (P < 0.05). The Portuguese SIS 2.0 evidenced suitable psychometric characteristics in terms of reliability and validity.