title: Relative validity of a food frequency questionnaire to identify dietary patterns in an adult Mexican population.
abstract: To examine the validity of a semi-quantitative food frequency questionnaire (SFFQ) to identify dietary patterns in an adult Mexican population.
  A 140-item SFFQ and two 24-hour dietary recalls (24DRs) were administered. Foods were categorized into 29 food groups used to derive dietary patterns via factor analysis. Pearson and intraclass correlations coefficients between dietary pattern scores identified from the SFFQ and 24DRs were assessed.
  Pattern 1 was high in snacks, fast food, soft drinks, processed meats and refined grains; pattern 2 was high in fresh vegetables, fresh fruits, and dairy products; and pattern 3 was high in legumes, eggs, sweetened foods and sugars. Pearson correlation coefficients between the SFFQ and the 24DRs for these patterns were 0.66 (P<0.001), 0.41 (P<0.001) and 0.29 (P=0.193) respectively.
  Our data indicate reasonable validity of the SFFQ, using factor analysis, to derive major dietary patterns in comparison with two 24DR.
authors.affiliation: Unidad de Investigacion en Epidemiología Clínica, Hospital Infantil de México. Ciudad de México, México.
authors.forename: Edgar
authors.initials: E
authors.lastname: Denova-Gutiérrez
authors.affiliation: Department of Clinical Laboratory and Nutritional Sciences, University of Massachusetts Lowell. Lowell, MA, USA.
authors.forename: Katherine L
authors.initials: KL
authors.lastname: Tucker
authors.affiliation: Centro de Investigación en Salud Poblacional, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.|Unidad de Investigación Epidemiológica y en Servicios de Salud, Instituto Mexicano del Seguro Social. Cuernavaca, México.
authors.forename: Jorge
authors.initials: J
authors.lastname: Salmerón
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.
authors.forename: Mario
authors.initials: M
authors.lastname: Flores
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.
authors.forename: Simón
authors.initials: S
authors.lastname: Barquera
mesh_terms: D000328:Adult; D004032:Diet; D004034:Diet Surveys; D005247:Feeding Behavior; D005502:Food / Q000145:classification*; D006801:Humans; D008800:Mexico; D015203:Reproducibility of Results