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Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were used to assess the construct validity of SF-36 Thai version in chronic renal disease patients. The patients (n=466) were interviewed at Srinagarind Hospital during March-May 2005. Data were randomly divided into two datasets for cross-validation. The first dataset was analyzed using EFA to reveal alternative models (AMs), while the second dataset was analyzed using CFA to compare the AMs and the original model assigned by SF-36 developers (Ware model). The construct validity of SF-36 Thai version in chronic renal disease patients was confirmed in this study. Results from CFA indicated that the Ware model was more parsimony than two AMs. The constructs of two AMs that resulted from the EFA differed from that was assigned by Ware et at. The results replicated the previous study in a Taiwanese general population, and these results confirmed the suggestion of using CFA to assess the construct validity of known construct measure.
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