Additional construct validity of the Schwartz Cancer Fatigue Scale.

The purpose of this article is to report the results of additional construct validity testing of the Schwartz Cancer Fatigue Scale. Latent variable modeling was used to determine the best fit of the data to the model. Testing with a heterogeneous sample (n = 303) did not support the proposed model. Using exploratory techniques a six-item, two-factor scale was formed which demonstrated that all measures of fit were consistently strong, and that the standardized solution factors loaded strongly. Reliabilities for the total scale and subscales were all greater than 0.80. These results provide preliminary support for the reliability and validity of the two-factor model of the six-item Schwartz Cancer Fatigue Scale.