title: Validity of a food frequency questionnaire to assess food intake in Mexican adolescent and adult population.
abstract: To assess the validity of a 140-item semiquantitative food frequency questionnaire (SFFQ), in Mexican adolescents and adults.
  Dietary intakes using a SFFQ and two 24-hour dietary recalls (24DRs), in nonconsecutive days during the same week were measured from 178 adolescents and 230 adults participating in the Mexican National Health and Nutrition Survey-2012.Validity was evaluated using correlation coefficients (CC),deattenuated CC, linear regression models, cross-classification analysis, and the Bland-Altman method.
  In adults, deattenuated correlation coefficients between the SFFQ and the 24DRs ranged from 0.30 for folate to 0.61 for saturated fat. In addition, 63% adults and 62% adolescents were classified in the same and adjacent quartile of nutrient intake when comparing data from SFFQ and 24DRs.
  The SFFQ had moderate validity for energy, macronutrients and micronutrients. It also had good validity to rank individuals according to their dietary intake of different nutrients.
authors.affiliation: Unidad de Epidermiología Clínica, Hospital Infantil de México Federico Gómez. Ciudad de México, México.
authors.forename: Edgar
authors.initials: E
authors.lastname: Denova-Gutiérrez
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.
authors.forename: Ivonne
authors.initials: I
authors.lastname: Ramírez-Silva
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.
authors.forename: Sonia
authors.initials: S
authors.lastname: Rodríguez-Ramírez
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Jiménez-Aguilar
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.
authors.forename: Teresa
authors.initials: T
authors.lastname: Shamah-Levy
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Morelos, México.
authors.forename: Juan A
authors.initials: JA
authors.lastname: Rivera-Dommarco
mesh_terms: D000293:Adolescent; D000328:Adult; D004032:Diet; D004034:Diet Surveys; D002149:Energy Intake; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico; D015203:Reproducibility of Results