Dagmar Amtmann1, Kendra S Liljenquist2,3, Alyssa Bamer2, Arnold R Gammaitoni4, Carey R Aron4, Bradley S Galer4, Mark P Jensen2. 1. Department of Rehabilitation Medicine, University of Washington, Box 354237, Seattle, WA, 98195, USA. dagmara@uw.edu. 2. Department of Rehabilitation Medicine, University of Washington, Box 354237, Seattle, WA, 98195, USA. 3. Pediatrics Department, Seattle Children's Research Institute, University of Washington, 2001 8th Avenue, Suite 400, Seattle, WA, 98195, USA. 4. Medical and Scientific Affairs, Zogenix, Inc, 5858 Horton Street, Suite 455, Emeryville, CA, 94608, USA.
Abstract
PURPOSE: To develop item response theory (IRT)-based item banks and short forms to measure stress and benefit related to caregiving for children, including children with epilepsy or other serious health conditions. METHODS: Items developed with feedback from neurologists and caregivers of children with epilepsy were tested in cognitive interviews and administered to caregivers of children with severe epilepsy (N = 128), down syndrome (N = 143) and muscular dystrophy (N = 129), as well as a community sample of US caregivers (N = 322). IRT was used to analyze the data. Test-retest reliability was assessed using a two-way random effects (2,1) intraclass correlation coefficient (ICC). Validity was assessed by a pattern of correlations with relevant constructs (stress, depression, anxiety, and resilience) and by the pattern of scores by known groups. RESULTS: Caregivers of children with serious health conditions reported more stress and less benefit than the general sample. The final caregiver stress item bank (k = 19) and the caregiver benefit item bank (k = 13) were calibrated using IRT and centered on a sample of community caregivers representative of the US general caregiver population. Short form scores are highly correlated with full bank scores (r ≥ 0.98) and IRT reliability exceed 90% for most levels. Test-retest reliability was high (ICC > 0.92) for banks and short forms. CONCLUSIONS: Results provide strong support for reliability and validity of the caregiver stress and benefit scores. Instruments are publicly available, flexible, brief, and provide reliable and valid scores of caregiver stress and benefit of caregivers of children with and without serious health conditions.
PURPOSE: To develop item response theory (IRT)-based item banks and short forms to measure stress and benefit related to caregiving for children, including children with epilepsy or other serious health conditions. METHODS: Items developed with feedback from neurologists and caregivers of children with epilepsy were tested in cognitive interviews and administered to caregivers of children with severe epilepsy (N = 128), down syndrome (N = 143) and muscular dystrophy (N = 129), as well as a community sample of US caregivers (N = 322). IRT was used to analyze the data. Test-retest reliability was assessed using a two-way random effects (2,1) intraclass correlation coefficient (ICC). Validity was assessed by a pattern of correlations with relevant constructs (stress, depression, anxiety, and resilience) and by the pattern of scores by known groups. RESULTS: Caregivers of children with serious health conditions reported more stress and less benefit than the general sample. The final caregiver stress item bank (k = 19) and the caregiver benefit item bank (k = 13) were calibrated using IRT and centered on a sample of community caregivers representative of the US general caregiver population. Short form scores are highly correlated with full bank scores (r ≥ 0.98) and IRT reliability exceed 90% for most levels. Test-retest reliability was high (ICC > 0.92) for banks and short forms. CONCLUSIONS: Results provide strong support for reliability and validity of the caregiver stress and benefit scores. Instruments are publicly available, flexible, brief, and provide reliable and valid scores of caregiver stress and benefit of caregivers of children with and without serious health conditions.