A revised short version of the compassionate love scale for humanity (CLS-H-SF): evidence from item response theory analyses and validity testing

Background: Compassionate love is defined as awareness and understanding of one's suffering, connecting with the distress, and being emotionally and cognitively moved to alleviate suffering. The Compassionate Love Scale for Humanity (CLS-H) was developed to measure compassion towards strangers who need help and/or are vulnerable. The present study aimed to develop an abbreviated version of the CLS-H using item response theory to provide a precise and non-redundant compassion measure for use in research and practice. Methods: Undergraduate students (N = 790; 65.8% females) completed the CLS-H and other measures intended to establish external validity. Items for the short version were selected based on high amounts of information and taking into account the content coverage of the construct. Results: The shortened scale consisted of 9 items and performed well in measuring a large spectrum of the underlying construct with acceptable reliability. In terms of validity, the previously observed pattern of correlations was confirmed demonstrating positive associations between compassionate love and measures of self-esteem, positive affect, and life satisfaction, as well as negative associations with negative affect and anxiety. Conclusions: Using IRT, we obtained a brief, precise, and valid tool for assessing compassionate love.