Factor analysis of a 13-item instrument administered to a sample of adult children (n = 71) generated two dimensions: FAA, anxiety over an anticipated caregiving role, and FAB, anxiety over the parent's anticipated decline. Both were internally consistent. In a second sample (n = 53), validity was evidenced because FAA was significantly related to measures of adult children's resources, whereas FAB was related to their attachment to the parent and perceptions of parental decline.
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Victor G. Cicirelli (1988) studied this question.