PMID- 14641954
OWN - NLM
STAT- MEDLINE
DCOM- 20040416
LR  - 20191210
IS  - 1368-9800 (Print)
IS  - 1368-9800 (Linking)
VI  - 6
IP  - 8
DP  - 2003 Dec
TI  - Reproducibility and validity of a food-frequency questionnaire for use among 
      low-income Brazilian workers.
PG  - 821-7
AB  - OBJECTIVES: To assess the reproducibility and validity a 127-item, habitual 
      intake, food-frequency questionnaire (FFQ), developed for low-income and 
      low-literacy Brazilian workers, by comparison with a 24-hour dietary recall 
      (24-HDR). DESIGN: The FFQ and 24-HDR were interviewer-administered at the local 
      workplace to each subject twice, with a period of 6 months between estimates; and 
      four 24-HDRs were conducted during the 4-month period between the two FFQs (FFQ1 
      and FFQ2). Reproducibility was tested by comparing mean nutrient intakes from the 
      two FFQs. Validity was determined by comparing the mean nutrient intakes from the 
      FFQs with the corresponding averages of the six 24-HDRs (reference method). 
      SETTING: Goiania City, in Central West Brazil. SUBJECTS: The study was based on 
      104 (62 women and 42 men) subjects, aged 18 to 60 years, who were randomly 
      selected. RESULTS: Dietary intake from the FFQ was higher than from the 24-HDR. 
      Reproducibility was assessed by Pearson correlation coefficients for nutrients 
      from FFQ1 and FFQ2, and ranged from 0.23 for retinol to 0.69 for total energy 
      (mean 0.52). Intra-class coefficients for nutrients averaged by the 24-HDRs 
      ranged from 0.29 for vitamin C to 0.76 for total energy; retinol was not 
      significant. In the validation study, correlation between the FFQ and the 24-HDR 
      ranged between 0.21 for vitamin C and 0.70 for total energy (mean 0.50). 
      Adjusting for total energy lowered the coefficients, except for calcium, retinol 
      and vitamin C. Coefficients increased with attenuation, ranging from 0.35 for 
      carbohydrate to 0.65 for calcium. CONCLUSIONS: Results indicate that this 
      questionnaire had satisfactory reproducibility and reasonable validity.
FAU - Fornes, Nelida Schmid
AU  - Fornes NS
AD  - Faculdade de Nutricao, Universidade Federal de Goias, Brazil. nelida@fanut.ufg.br
FAU - Stringhini, Maria Luiza Ferreira
AU  - Stringhini ML
FAU - Elias, Berenice Muller
AU  - Elias BM
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Validation Study
PL  - England
TA  - Public Health Nutr
JT  - Public health nutrition
JID - 9808463
SB  - IM
MH  - Adult
MH  - Brazil
MH  - *Diet Records
MH  - Diet Surveys
MH  - Energy Intake
MH  - Feeding Behavior
MH  - Female
MH  - Food Analysis
MH  - Humans
MH  - Interviews as Topic
MH  - Male
MH  - Middle Aged
MH  - *Nutrition Assessment
MH  - Nutritive Value
MH  - Occupations/classification
MH  - *Poverty
MH  - Reproducibility of Results
MH  - *Surveys and Questionnaires
EDAT- 2003/12/04 05:00
MHDA- 2004/04/17 05:00
CRDT- 2003/12/04 05:00
PHST- 2003/12/04 05:00 [pubmed]
PHST- 2004/04/17 05:00 [medline]
PHST- 2003/12/04 05:00 [entrez]
AID - 10.1079/phn2003505 [doi]
PST - ppublish
SO  - Public Health Nutr. 2003 Dec;6(8):821-7. doi: 10.1079/phn2003505.