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Validation of a semi-quantitative adolescent food frequency questionnaire applied at a public school in São Paulo, Brazil.
Eur J Clin Nutr. 2003 May; 57(5):629-35.EJ

Abstract

OBJECTIVE

To develop a food frequency questionnaire for adolescents (AFFQ) and demonstrate its relative validity.

DESIGN

The final version of the AFFQ was composed of 76 food items previously identified according to their contribution in nutrients and overall importance within the eating habits of this population group. The validation study, which was undertaken during a 6 month period (June to November 1999), was administered to a sample of 79 who answered at least three 24 h dietary recalls (R24 h) applied at intervals of 45 days and one AFFQ at the end of the study. Applying the paired t-test and calculating Pearson correlation coefficients on nutrient data, differences in the mean of nutrients were obtained. Correlation coefficients between the mean energy-adjusted nutrients computed by the two methods were calculated, and correction was made for within-person variability. Agreement was evaluated by distribution of the adolescents according to quartiles of consumption. LOCUS: A public school within the metropolitan region of São Paulo city.

RESULTS

A high variability in the dietary intake of adolescents was observed, with high rates of variability for cholesterol, retinal and vitamin C. The Pearson correlation coefficients, after being adjusted and corrected for variability, ranged from 0.10 to 0.72 among females and from 0.16 and 0.91 among males. The mean correlation coefficient for the entire group was 0.52.

CONCLUSIONS

These results indicate that the AFFQ provides a potentially reliable scale for categorizing individuals by level of past intake of most nutrients, excluding retinol and iron.

Authors+Show Affiliations

Department of Nutrition, School of Public Health, University of São Paulo, São Paulo, Brazil. betzy_slater@hotmail.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12771963

Citation

Slater, B, et al. "Validation of a Semi-quantitative Adolescent Food Frequency Questionnaire Applied at a Public School in São Paulo, Brazil." European Journal of Clinical Nutrition, vol. 57, no. 5, 2003, pp. 629-35.
Slater B, Philippi ST, Fisberg RM, et al. Validation of a semi-quantitative adolescent food frequency questionnaire applied at a public school in São Paulo, Brazil. Eur J Clin Nutr. 2003;57(5):629-35.
Slater, B., Philippi, S. T., Fisberg, R. M., & Latorre, M. R. (2003). Validation of a semi-quantitative adolescent food frequency questionnaire applied at a public school in São Paulo, Brazil. European Journal of Clinical Nutrition, 57(5), 629-35.
Slater B, et al. Validation of a Semi-quantitative Adolescent Food Frequency Questionnaire Applied at a Public School in São Paulo, Brazil. Eur J Clin Nutr. 2003;57(5):629-35. PubMed PMID: 12771963.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Validation of a semi-quantitative adolescent food frequency questionnaire applied at a public school in São Paulo, Brazil. AU - Slater,B, AU - Philippi,S T, AU - Fisberg,R M, AU - Latorre,M R D O, PY - 2002/02/27/received PY - 2002/07/01/revised PY - 2002/07/02/accepted PY - 2003/5/29/pubmed PY - 2003/9/4/medline PY - 2003/5/29/entrez SP - 629 EP - 35 JF - European journal of clinical nutrition JO - Eur J Clin Nutr VL - 57 IS - 5 N2 - OBJECTIVE: To develop a food frequency questionnaire for adolescents (AFFQ) and demonstrate its relative validity. DESIGN: The final version of the AFFQ was composed of 76 food items previously identified according to their contribution in nutrients and overall importance within the eating habits of this population group. The validation study, which was undertaken during a 6 month period (June to November 1999), was administered to a sample of 79 who answered at least three 24 h dietary recalls (R24 h) applied at intervals of 45 days and one AFFQ at the end of the study. Applying the paired t-test and calculating Pearson correlation coefficients on nutrient data, differences in the mean of nutrients were obtained. Correlation coefficients between the mean energy-adjusted nutrients computed by the two methods were calculated, and correction was made for within-person variability. Agreement was evaluated by distribution of the adolescents according to quartiles of consumption. LOCUS: A public school within the metropolitan region of São Paulo city. RESULTS: A high variability in the dietary intake of adolescents was observed, with high rates of variability for cholesterol, retinal and vitamin C. The Pearson correlation coefficients, after being adjusted and corrected for variability, ranged from 0.10 to 0.72 among females and from 0.16 and 0.91 among males. The mean correlation coefficient for the entire group was 0.52. CONCLUSIONS: These results indicate that the AFFQ provides a potentially reliable scale for categorizing individuals by level of past intake of most nutrients, excluding retinol and iron. SN - 0954-3007 UR - https://www.unboundmedicine.com/medline/citation/12771963/Validation_of_a_semi_quantitative_adolescent_food_frequency_questionnaire_applied_at_a_public_school_in_S��o_Paulo_Brazil_ L2 - https://doi.org/10.1038/sj.ejcn.1601588 DB - PRIME DP - Unbound Medicine ER -