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None of the equations had good agreement with bioimpedance analysis. CONCLUSION It was concluded that skinfold thickness and bioimpedance analysis should not be used interchangeably in children and adolescents. OBJECTIVES To develop and validate an instrument about nutritional knowledge and feeding practices to be used in children aged 7-11 years, based on the latest Brazilian Food Guide. METHODS Review on the subject; instrument creation; content validity with two groups of judges first, nutritionists and, after adjustments, a multid