Development and Psychometric Evaluation of the Motivation for Healing Scale in Patients with Cancer

Abstract

Introduction: This study was conducted to develop and validate a Motivation for Healing Scale (MHS) in Cancer. Methods: in this methodological study, the MHS draft was developed based on the approach of Waltz and colleagues using existing scales and concept analysis. The psychometric features, including face validity (qualitative and quantitative), content validity (qualitative and quantitative), structural validity (exploratory and confirmatory factors), and construct validity (convergent and discriminant validity) were assessed. Finally, the reliability was evaluated using internal consistency, and stability. Results: Based on the results of the qualitative phase, an initial item pool was generated with 55 items, Exploratory and confirmatory factor analyses were performed on the data collected from 404 patients. 25 Items were excluded during the psychometric evaluation phases. Reliability assessment and internal consistency assessment revealed that Cronbach’s alpha value of the 25-item MHS was 0.912. The results of intraclass correlation coefficient (0.93, 95% CI: 0.86– 0.96) showed the stability was strong. Conclution: The 25-item MHS is a valid and reliable scale for the assessment of motivation for healing in patients with cancer.