Reliability and Validity of the Adapted Persian Version of the Physical Activity Scale for Individuals with Physical Disabilities

Objective: The specific objective of this study was to culturally adapt the original English version of the Physical Activity Scale for Individuals with Physical Disabilities (PASIPD) for the Persian-speaking persons with lower-limb amputations (LLAs), and to evaluate its reliability and construct validity. Methods: This was a multicenter cross-sectional repeated measure study. Cultural adaptation process was conducted according to an accepted international guideline. Thus, a total of 197 Persian-speaking individuals with LLA was recruited to investigate the reliability and validity of the PASIPD. Reliability analyses were assessed by Cronbach’s α and Pearson product-moment correlation coefficient. Association between the PASIPD scores and the Prosthetic Limb User Survey of Mobility scores was examined for evaluating convergent validity of the PASIPD. Known-groups validity was assessed based on sex, amputation causes, and amputation levels. Results: The PASIPD had an acceptable internal uniformity (Cronbach alpha of 0.68) and test-retest reproducibility (r= 0.70). There was a small correlation between the PASIPD and Prosthetic Limb User Survey of Mobility (r=0.26; p=0). Some items of PASIPD could discriminate individuals with different causes of amputation and sex. Factor analysis extracted four main factors that explained for 65.4% of the variance. Discussion: The Persian version of the PASIPD has an acceptable reliability and validity for assessing the physical activity of persons with LLAs.