Worry about performance: a unique dimension of caregiver burden

Area of Science:

• Gerontology
• Psychology
• Sociology

Background:

• Recent research questions the traditional dual-factor model of caregiver burden measured by the Zarit Burden Interview (ZBI).
• Studies consistently identify a distinct dimension: worry about caregiver performance (WaP), comprising specific ZBI items.
• This dimension challenges established personal and role strain paradigms.

Purpose of the Study:

• To compare the worry about caregiver performance (WaP) dimension against conventional Zarit Burden Interview (ZBI) domains.
• To investigate the validity and characteristics of WaP in a predominantly Chinese multi-ethnic Asian population.
• To explore the unique predictors and disease severity associations of WaP.

Main Methods:

• A factor analysis of the 22-item Zarit Burden Interview (ZBI) was conducted on 130 caregiver-patient dyads.
• The worry about caregiver performance (WaP) factor was compared with personal strain and role strain factors.
• Analyses included internal consistency, inter-factor correlation, item-to-total ratio across Clinical Dementia Rating (CDR) stages, predictor identification, and interaction effects.

Main Results:

• Worry about caregiver performance (WaP) showed poor correlation with other Zarit Burden Interview (ZBI) factors but exhibited high internal consistency (Cronbach's α = 0.92).
• WaP was highly endorsed in mild cognitive impairment, peaking at CDR stage 1, unlike other factors that increased with disease severity.
• Younger caregiver age was the primary predictor of WaP, contrasting with behavioral/functional problems predicting other factors. A significant interaction between WaP and psychological strain was observed.

Conclusions:

• The findings support worry about caregiver performance (WaP) as a distinct burden dimension, separate from traditional Zarit Burden Interview (ZBI) domains.
• WaP is particularly relevant in Asian societies with strong familial care obligations.
• Further research is recommended to fully delineate the construct of worry about caregiver performance (WaP).