The reliability and validity of the Japanese version of the Stroke Impact Scale version 3.0

It is important to evaluate body functions and structures, activity, and participation in stroke rehabilitation. The Stroke Impact Scale (SIS), a new stroke-specific self-report measure that was developed by Duncan et al, is widely used to measure multidimensional consequences about health-related quality of life. The SIS version 3.0 includes 9 domains (strength, hand function, activity of daily living and instrumental activity of daily living, mobility, communication, emotion, memory and thinking, participation, and recovery). Patients are asked to make a percentage rating of their recovery since their stroke on a visual analog scale of 0 to 100 for the stroke recovery domain. Each item in the 8 domains other than stroke recovery are scored in a range of 1 to 5 as a raw score and calculated using the manual to a final score. We developed a Japanese version of the SIS version 3.0 and assessed its reliability and validity in 32 chronic stroke survivors. The internal consistency (Cronbach's α > 0.70) was satisfactory. The testretest reliability (ICC, 0.86 to 0.96) was also satisfactory. Regarding convergent validity, a significant correlation (Spearman's correlation coefficient, P < 0.05) was found between the SIS physical domain score and Brunnstrom stage (r, 0.49 to 0.53) and short form 8 (r = 0.82). The Japanese version of the SIS version 3.0 is valid, reliable, and clinically useful for stroke survivors.