title: Performance of the quantitative food frequency questionnaire used in the Brazilian center of the prospective study Natural History of Human Papillomavirus Infection in Men: The HIM Study.
abstract: The Natural History of Human Papillomavirus (HPV) Infection in Men: The HIM Study is a prospective multicenter cohort study that, among other factors, analyzes participants' diet. A parallel cross-sectional study was designed to evaluate the validity and reproducibility of the quantitative food frequency questionnaire (QFFQ) used in the Brazilian center from the HIM Study. For this, a convenience subsample of 98 men aged 18 to 70 years from the HIM Study in Brazil answered three 54-item QFFQ and three 24-hour recall interviews, with 6-month intervals between them (data collection January to September 2007). A Bland-Altman analysis indicated that the difference between instruments was dependent on the magnitude of the intake for energy and most nutrients included in the validity analysis, with the exception of carbohydrates, fiber, polyunsaturated fat, vitamin C, and vitamin E. The correlation between the QFFQ and the 24-hour recall for the deattenuated and energy-adjusted data ranged from 0.05 (total fat) to 0.57 (calcium). For the energy and nutrients consumption included in the validity analysis, 33.5% of participants on average were correctly classified into quartiles, and the average value of 0.26 for weighted kappa shows a reasonable agreement. The intraclass correlation coefficients for all nutrients were greater than 0.40 in the reproducibility analysis. The QFFQ demonstrated good reproducibility and acceptable validity. The results support the use of this instrument in the HIM Study.
authors.affiliation: Nutrition and Public Health Program, Nutrition Department, School of Public Health, University of São Paulo, São Paulo-SP, Brazil.
authors.forename: Juliana Araujo
authors.initials: JA
authors.lastname: Teixeira
authors.forename: Maria Luiza
authors.initials: ML
authors.lastname: Baggio
authors.forename: Anna R
authors.initials: AR
authors.lastname: Giuliano
authors.forename: Regina Mara
authors.initials: RM
authors.lastname: Fisberg
authors.forename: Dirce Maria Lobo
authors.initials: DM
authors.lastname: Marchioni
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015992:Body Mass Index; D001938:Brazil / Q000453:epidemiology; D015331:Cohort Studies; D004032:Diet; D015930:Diet Records; D002149:Energy Intake; D005188:False Negative Reactions; D005502:Food; D006801:Humans; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D030361:Papillomavirus Infections / Q000453:epidemiology*; D011446:Prospective Studies; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires