Abstract
Valid and reliable measures of nutrition knowledge are needed for program evaluation to develop predictive models of learning, food intake, and health behavior. The food label is an essential component of diabetes education. This study describes how an instrument designed to assess knowledge of food labels was pretested for reliability and validity. Five people assessed the test for face validity and rated the test at least 4 on a 5-point scale. The index of content validity was 0.76 based on a review of the test by five dietitians. The test was used to evaluate a nutrition intervention for women with diabetes using a pretest/post-test control-group design (n = 43). The coefficient of stability was 0.86 using the test–retest method among participants in the control group. The reliability estimate for internal consistency was 0.81 based on Kuder-Richardson formula 20. Item analysis found individual questions to be within acceptable limits. Participants in the experimental group showed significant gains in knowledge at post-test (p < .01), supporting the instructional sensitivity of the test. The approach used to assess the reliability and validity of an instrument was feasible and effective and is recommended prior to implementing a test for outcome evaluation.
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