Validity and reliability study of the Turkish version of the satisfaction module of the orthotic prosthesis users survey for individuals using lower extremity orthoses

The aim of this study is to investigate the validity and reliability of the Turkish version of the Device and Service Satisfaction module of the Orthosis/Prosthesis Users Survey in individuals using lower extremity orthosis. The scale was named OPKA-M and could be applied to 67 people. By interviewing the developer of the survey, it was agreed that people over the age of 12 could do the survey independently, and statistical evaluations were carried out with 48 lower extremity orthosis users over the age of 12. The reliability analysis of the OPKA-M scale was determined by the test-retest method, the internal consistency was determined by Cronbach's alpha analysis, the construct validity of the scale was determined by looking at its correlation with the VAS, which evaluates general satisfaction, and additionally by calculating EFA and CFA. The test-retest reliability of the questionnaire was found to be excellent (ICC=0.995, 95%CI:0.986-0.998). As a result of the cronbach alpha analysis of the OPKA-M device and service satisfaction scales, the values were found to be high, consistent with and close to internal consistency(device cronbachα=0.845, service cronbachα=0.925). A positive and significant correlation was found between the scores obtained from the VAS scale(r=0.623, p<0.001). According to the EFA results, factor loads in the OPKA-M device satisfaction scale were found to be between 0.437-0.838 and in the service satisfaction scale between 0.493-0.920. In CFA, it can be said that the model does not fit well with the data according to the values of the fit indices, and a change is needed to improve the fit of the model, provided that the original version of the scale is adhered to. It has been concluded that the OPKA-M scale may be a suitable scale that can be used to evaluate satisfaction in clinical and scientific research in people using lower extremity orthoses.