Abstract
Purpose: The purpose of this study was to develop a new scale, the Stroke Physical Performance Scale (SPPS), based on the Rasch model. The SPPS evaluates physical performance in a standing position and during ambulation related to the activities of daily living (ADL) of stroke patients. Methods: A preliminary scale was developed that consisted of 25 items representing physical performance selected by observation of the ADL. This scale was tested for stroke patients (N = 102) in 2 rehabilitation hospitals using 5-level rating categories. Their responses were analyzed using the Rasch model to select rating categories and items. After the development of the SPPS, we investigated its unidimensionality and reliability. Results: The rating category analysis integrated the category of “supervision” into “light assistance”, so that rating involved 4-level categories. The item selection analysis excluded 9 items, the SPPS therefore became a 16-item scale, which fitted the Rasch model. The SPPS demonstrated good unidimensionality and reliability. Conclusion: The SPPS was constructed as a scale to evaluate physical performance in a standing position and during ambulation related to the ADL of stroke patients. It may be valuable to evaluate changes in physical performance using an interval scale both in a clinical setting and for clinical research.
