Factorial structure analysis of food selection-related health literacy scale among patients receiving warfarin therapy post heart valve surgery
Keywords:
factorial structure analysis, health literacy, food selection, warfarinAbstract
The purpose of this study was to investigate the factorial structure of the food selection related health literacy scale developed by the researchers in a previous study. The 16-item scale was evaluated on 160 individuals who were prescribed warfarin after heart valve surgery. The Kaiser-Meyer-Olkin (KMO) test was used to determine sample adequacy, and Bartlett's test was employed to determine whether the data was suitable for factor analysis. Exploratory factor analysis (EFA) using Varimax rotation and confirmatory factor analysis (CFA) was used to analyze the factorial structure.
The KMO test result was 0.77, indicating the average sample adequacy. The Bartlett’s test of Sphericity gave a p-value of < 0.05, χ2 62.77, (df 127), demonstrating the data suitability for factor analysis. The EFA revealed that there were factors with eigenvalues greater than one that explained 59.93 percent of the variance. In the EFA, a new factor of the model has developed processing health literacy. However, the CFA produced a relative χ2 of 2.33, an SRMR of 0.08, an RMSEA of 0.09, a GFI of 0.84, and a CFI of 0.75. After model adjustment, the CFA recommended model 2, which consisted of 4 factors and 14 items and yielded a relative χ2 of 1.50, an SRMR of 0.06, an RMSEA of 0.06, a GFI of 0.92, and a CFI of 0.93. As a result, the model 2 produced a superior model fit.
This study indicated the need for further refinement of the factorial structure of the food selection-related health literacy scale to be utilized among patients taking warfarin following heart valve surgery.
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