title: Factors associated with the calibration of a food frequency questionnaire for the Bambuí Project, Brazil.
abstract: BACKGROUND
  The present study aimed to calibrate a food frequency questionnaire (FFQ) using one 24-h recall (R24) associated with foodstuff replicas.
  
  
  METHODS
  Calibration was performed by linear regression. Of a probability sample of 150 individuals (>18 years) of the town of Bambui, 98 completed the study.
  
  
  RESULTS
  The mean age of the participants was 43.8 years and 63.3% were women. The calibration of the FFQ included sex for the estimation of iron, protein and zinc; and an interaction between sex and R24 was significant for vitamin A and cholesterol models. Age contributed to the vitamin C, polyunsaturated fatty acids, proteins and zinc models, and an interaction between age and R24 was significant for protein and zinc.
  
  
  CONCLUSIONS
  Calibration coefficients and many interactions in linear regression models revealed important differences between dietary methods, indicating the complexity encountered when combining two methodologies for estimating food intake.
authors.affiliation: Departamento de Enfermagem Materno-Infantil e Saúde Pública-Escola de Enfermagem, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
authors.forename: A C S
authors.initials: AC
authors.lastname: Lopes
authors.forename: W T
authors.initials: WT
authors.lastname: Caiaffa
authors.forename: R
authors.initials: R
authors.lastname: Sichieri
authors.forename: S A
authors.initials: SA
authors.lastname: Mingoti
authors.forename: M F
authors.initials: MF
authors.lastname: Lima-Costa
mesh_terms: D000328:Adult; D001205:Ascorbic Acid / Q000008:administration & dosage; D001938:Brazil; D002138:Calibration; D002784:Cholesterol; D004032:Diet; D004044:Dietary Proteins / Q000008:administration & dosage; D002149:Energy Intake; D005231:Fatty Acids, Unsaturated / Q000008:administration & dosage; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D011939:Mental Recall; D009749:Nutrition Surveys; D011795:Surveys and Questionnaires; D014801:Vitamin A / Q000008:administration & dosage; D015032:Zinc / Q000008:administration & dosage
chemical_list: D004044:Dietary Proteins; D005231:Fatty Acids, Unsaturated; D014801:Vitamin A; D002784:Cholesterol; D015032:Zinc; D001205:Ascorbic Acid