PMID: 16632898Apr 25, 2006Paper

Rasch analysis of a new construct: functional caregiving for adult children with intellectual disabilities

Journal of Applied Measurement
Shu-Pi C ChenSheila Ryan-Henry

Abstract

This research examined empirical evidence for a new construct, Functional Caregiving, which is a theory about mothers' caregiving of their adult children with intellectual disabilities. A sample of 108 biological mothers and primary caregivers rated survey items about their confidence to perform caregiving tasks. Rasch rating scale analysis found 61 items defined an empirical construct with three caregiving levels: Advocacy, Personal Caregiving, and Community. Results show item separation was 3.11 with high reliability, .91, and mother separation was 2.93 and reliability, .90. Both items and mothers showed adequate INFIT and OUTFIT values. Item invariance was confirmed between older and younger mothers, and principle components analysis of item residuals did not reveal any major dimensionality threats. Item decomposition analysis showed FC content theory to account for 58 percent of item calibration variance (R2 = .58, F = 42.3, p < .001). These results have important practical implications for health and social services, as well as family caregiving, interdisciplinary practices, and health policy development.

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