17 and 21 According to the literature, load values ≥ 0.3 are considered ideal for tool validation. In this study, all items that remained in the tool had values within the suggested range. Regarding internal consistency, Cronbach’s alpha measure ranges from 0 to 1, and the minimum value recommended to consider a test as having good internal consistency is > 0.615; the present study showed values > 0.9. LDN-193189 in vivo The analysis of reproducibility showed satisfactory results. The coefficients were higher than those obtained in the study that evaluated the KAB (knowledge, attitudes, and behaviors) questionnaire in Native American children.9 The total

variance remained at 46.87%. Some authors have suggested that item extraction should continue until Selleck Screening Library the researcher attains at least 60% variance.15 However, other studies suggest that the criterion of cumulative variance should not be stringently used when extracting items, because analyses that use load values would be enough to define the variables that should be part of the tool.15 and 22 Comparing the mean of correct answers between the two applications of test and re-test, the study showed no significant statistical difference. According to the literature, one of the factors to establish construct reliability is the stability of test results, that is, the degree of score accuracy. The more homogeneous the test, the more reliable it is.23 Regarding the schoolchildren’s

knowledge, the mean score remained above nine correct answers in 12 questions, i.e., the children have a good knowledge. However, other studies have reported Telomerase that the schoolchildren’s knowledge is very poor regarding nutritional aspects.10 and 24 Some authors have studied the reproducibility and validity of a questionnaire aimed at U.S. high-school students, which contained questions about nutrition and physical activity. The productivity analysis results showed more consistent answers between test and re-test when the questions were related to the day before.25 However, it is noteworthy that the CARDIOKID is a tool that aims to determine children’s

knowledge about healthy habits and risk factors for cardiovascular disease, which minimizes memory-related problems, but represents a more complex cognitive task, as it is related to the children’s knowledge. In another study related to the reproducibility of a questionnaire on food consumption illustrated with pictures, researchers found that children in third and fourth grades, i.e., older than 7 years, provide better measures of reproducibility than did the original series.26 Among the limitations of this study is the use of a convenience sample consisting of students from public schools and philanthropic institutions that attended different school shifts, all in the city of Porto Alegre, Brazil. Therefore, the generalization of this study may be limited, and it is necessary to apply this questionnaire again in other contexts.