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.