Validation of a food frequency questionnaire designed for adolescents in Salvador, Bahia, Brazil
Keywords:
Adolescent, Food consumption, Validation stidiesAbstract
Objective
This study assessed the validity of a Food Frequency Questionnaire used to assess food intake in adolescents in Salvador, Bahia, Brazil.
Methods
Seventy adolescents enrolled in public schools aged 11 to 17 years participated in this study. The dietary intake of the adolescents was assessed using the Food Frequency Questionnaire and the mean value of three-day foodrecord, used as the reference method. The mean (and standard deviation) energy and nutrient intakes estimated from the Food Frequency Questionnaire and food records were calculated. The paired Student’s t test was used to determine differences between the data.
Results
Pearson’s correlation coefficient and Kappa statistics were used to measure the strength of the association between the two instruments. There was variation in the crude unadjusted (r=0.61-0.73) and deattenuated (r=0.33-0.99) Pearson correlation coefficients. After adjusting for energy, the crude and deattenuated coefficients ranged from r=0.53-0.81 and r=0.27-0.99, respectively. The intake of energy and most nutrients were found to be adequate, except for fiber (r=0.27) and calcium (r=0.33), which showed a weak correlation. Kappa statistics showed good correlation between all values varying from r=0.47 to 0.73.
Conclusion
It is considered that an average r value greater than 0.40 indicates a good correlation, the results obtained indicate the good ability of the Food Frequency Questionnaire to assess individuals according to their usual intake of most nutrients.
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Copyright (c) 2023 Jean Márcia Oliveira MASCARENHAS, Rita de Cássia Ribeiro SILVA, Maria Ester Pereira Conceição MACHADO, Carlos Antonio de Souza Teles SANTOS, Dirce Maria Lobo MARCHIONI, Maurício Lima BARRETO
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