Validation of the Sibling Perception Questionnaire in healthy siblings of children with chronic illnesses

The purpose of the study was to assess the psychometric properties of the parent-report version of the Sibling Perception Questionnaire (SPQ) in well-siblings. Participants were 200 caregivers of healthy children ages 9-17 years who had a sibling (ages 0-18 years) diagnosed with cancer, diabetes, cystic fibrosis, epilepsy, spina bifida, or congenital heart disease. The SPQ had acceptable internal consistency reliability for the total score (α = 0.83) and displayed acceptable convergent validity as evidenced by medium to large positive correlations with the Strengths and Difficulties Questionnaire and Pediatric Quality of Life Inventory 4.0 (r's ranged from 0.39 to 0.56). The original four-factor model displayed a poor model fit (CFI = 0.6, RMSEA = 0.11, TLI = 0.55, SRMR = 0.14) in comparison to a revised, 14-item four-factor model (CFI = 0.92, RMSEA = 0.07, TLI = 0.90, SRMR = 0.06). The shortened, 14-item parent-report version of the SPQ largely demonstrated good psychometric properties and has the potential to reduce the burden of caregivers filling out the measure.