Document Detail

Validation of a semi-quantitative adolescent food frequency questionnaire applied at a public school in São Paulo, Brazil.
MedLine Citation:
PMID:  12771963     Owner:  NLM     Status:  MEDLINE    
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.
B Slater; S T Philippi; R M Fisberg; M R D O Latorre
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of clinical nutrition     Volume:  57     ISSN:  0954-3007     ISO Abbreviation:  Eur J Clin Nutr     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-05-28     Completed Date:  2003-09-03     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8804070     Medline TA:  Eur J Clin Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  629-35     Citation Subset:  IM    
Department of Nutrition, School of Public Health, University of São Paulo, São Paulo, Brazil.
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MeSH Terms
Ascorbic Acid / administration & dosage
Calcium, Dietary / administration & dosage
Cholesterol, Dietary / administration & dosage
Diet Records
Dietary Carbohydrates / administration & dosage
Dietary Fats / administration & dosage
Dietary Fats, Unsaturated / administration & dosage
Dietary Fiber / administration & dosage
Dietary Proteins / administration & dosage
Energy Intake
Food Preferences*
Iron, Dietary / administration & dosage
Nutrition Assessment
Reproducibility of Results
Vitamin A / administration & dosage
Reg. No./Substance:
0/Calcium, Dietary; 0/Cholesterol, Dietary; 0/Dietary Carbohydrates; 0/Dietary Fats; 0/Dietary Fats, Unsaturated; 0/Dietary Proteins; 0/Iron, Dietary; 11103-57-4/Vitamin A; 50-81-7/Ascorbic Acid

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