Factor Analysis of Caregiver Strain Questionnaire in Clinical Research

Caregiver Strain Questionnaire (CGSQ) is expected to have multiple dimensions. It was the aim of this study to investigate and confirm the dimensional structure of CGSQ measured from subjects. We used rotated principalcomponents analysis as EPA to explore the dimensional structure of CGSQ. The first principal component explained 86% of the variance in the data. Cumulative variance for 3 factors is 99.3%. Three dimensions (objective caregiver strain, internalized subjective caregiver strain and externalized subjective caregiver strain) were found. Reliability of the latent constructs was measured with Cronbach’s alpha (0.943, 0.876, 0.877). Finally, CPA demonstrated the relationship between the observed CGSQ and their underlying latent dimensions. SAS® procedures such as PROC CORR, PROC CALIS, PROC FACTOR were used for this study.