Personal growth in caregivers of persons with brain injury or multiple sclerosis.

An existing scale of personal growth in caregivers of people with multiple sclerosis (MS) was expanded for use with an acquired brain injury (ABI) population, and was modified following additional psychometric analyses. A cross-sectional online survey was administered to 315 caregiving partners of persons with MS and 310 family caregivers of persons with ABI. Principal component analysis (PCA) performed on the original 32-item instrument yielded a 4-component, 17-item solution with correlated subscales with solid psychometric properties. Subscales were labelled Appreciation, Positivity, Adjustment, and Spirituality. Secondary PCA conducted revealed three subscales (five items each) correlated moderately while the fourth, Spirituality, remained distinct. The sum of the three five-item subscales may serve as a total score. Reliability analysis yielded acceptable-to-high internal consistency. Comparisons of the PGS with existing instruments demonstrated its discriminant/convergent validity. Two kinds of latent class analyses were conducted on the 15-item PGS to identify three latent classes that spanned the neurologic groups, revealing that measurement invariance was held for the instrument in this sample. An instrument with sound psychometric properties was established, designed to assess personal growth in caregivers of individuals with ABI or MS. Future work should explore its value in other populations and as a metric of changes over time.