title: Methodology for estimating dietary data from the semi-quantitative food frequency questionnaire of the Mexican National Health and Nutrition Survey 2012.
abstract: To describe the methodology used to clean up and estimate dietary intake (DI) data from the Semi-Quantitative Food Frequency Questionnaire (SFFQ) of the Mexican National Health and Nutrition Survey 2012.
  DI was collected through a shortterm SFFQ regarding 140 foods (from October 2011 to May 2012). Energy and nutrient intake was calculated according to a nutrient database constructed specifically for the SFFQ.
  A total of 133 nutrients including energy and fiber were generated from SFFQ data. Between 4.8 and 9.6% of the survey sample was excluded as a result of the cleaning process.Valid DI data were obtained regarding energy and nutrients consumed by 1 212 pre-school children, 1 323 school children, 1 961 adolescents, 2 027 adults and 526 older adults.
  We documented the methodology used to clean up and estimate DI from the SFFQ used in national dietary assessments in Mexico.
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Mexico.
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, Mexico.
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, Mexico.
authors.forename: Danae
authors.initials: D
authors.lastname: Valenzuela-Bravo
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Mexico.
authors.forename: Brenda
authors.initials: B
authors.lastname: Martinez-Tapia
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Mexico.
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, Mexico.
authors.forename: Elsa Berenice
authors.initials: EB
authors.lastname: Gaona-Pineda
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Mexico.
authors.forename: Salomón
authors.initials: S
authors.lastname: Angulo-Estrada
authors.affiliation: Centro de Investigación en Nutrición y Salud, Instituto Nacional de Salud Pública. Cuernavaca, Mexico.
authors.forename: Teresa
authors.initials: T
authors.lastname: Shamah-Levy
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004032:Diet; D002149:Energy Intake; D006801:Humans; D008800:Mexico; D008875:Middle Aged; D009749:Nutrition Surveys / Q000379:methods*; D013997:Time Factors