title: Validation of nutrient intake using an FFQ and repeated 24 h recalls in black and white subjects of the Adventist Health Study-2 (AHS-2).
abstract: OBJECTIVE
  To validate a 204-item quantitative FFQ for measurement of nutrient intake in the Adventist Health Study-2 (AHS-2).
  
  
  METHODS
  Calibration study participants were randomly selected from the AHS-2 cohort by church, and then subject-within-church. Each participant provided two sets of three weighted 24 h dietary recalls and a 204-item FFQ. Race-specific correlation coefficients (r), corrected for attenuation from within-person variation in the recalls, were calculated for selected energy-adjusted macro- and micronutrients.
  
  
  METHODS
  Adult members of the AHS-2 cohort geographically spread throughout the USA and Canada.
  
  
  METHODS
  Calibration study participants included 461 blacks of American and Caribbean origin and 550 whites.
  
  
  RESULTS
  Calibration study subjects represented the total cohort very well with respect to demographic variables. Approximately 33 % were males. Whites were older, had higher education and lower BMI compared with blacks. Across fifty-one variables, average deattenuated energy-adjusted validity correlations were 0.60 in whites and 0.52 in blacks. Individual components of protein had validity ranging from 0.40 to 0.68 in blacks and from 0.63 to 0.85 in whites; for total fat and fatty acids, validity ranged from 0.43 to 0.75 in blacks and from 0.46 to 0.77 in whites. Of the eighteen micronutrients assessed, sixteen in blacks and sixteen in whites had deattenuated energy-adjusted correlations >or=0.4, averaging 0.60 and 0.53 in whites and blacks, respectively.
  
  
  CONCLUSIONS
  With few exceptions validity coefficients were moderate to high for macronutrients, fatty acids, vitamins, minerals and fibre. We expect to successfully use these data for measurement error correction in analyses of diet and disease risk.
authors.affiliation: Department of Epidemiology & Biostatistics, School of Public Health, Loma Linda University, Loma Linda, CA 92350, USA. kjaceldo@llu.edu
authors.forename: Karen
authors.initials: K
authors.lastname: Jaceldo-Siegl
authors.forename: Synnove F
authors.initials: SF
authors.lastname: Knutsen
authors.forename: Joan
authors.initials: J
authors.lastname: Sabaté
authors.forename: W Lawrence
authors.initials: WL
authors.lastname: Beeson
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Chan
authors.forename: R Patti
authors.initials: RP
authors.lastname: Herring
authors.forename: Terrence L
authors.initials: TL
authors.lastname: Butler
authors.forename: Ella
authors.initials: E
authors.lastname: Haddad
authors.forename: Hannelore
authors.initials: H
authors.lastname: Bennett
authors.forename: Susanne
authors.initials: S
authors.lastname: Montgomery
authors.forename: Shalini S
authors.initials: SS
authors.lastname: Sharma
authors.forename: Keiji
authors.initials: K
authors.lastname: Oda
authors.forename: Gary E
authors.initials: GE
authors.lastname: Fraser
mesh_terms: D000328:Adult; D001741:Black or African American / Q000706:statistics & numerical data*; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D002138:Calibration; D015331:Cohort Studies; D004034:Diet Surveys; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004041:Dietary Fats / Q000008:administration & dosage; D004044:Dietary Proteins / Q000008:administration & dosage; D002149:Energy Intake; D005247:Feeding Behavior / Q000208:ethnology*; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall; D018977:Micronutrients / Q000008:administration & dosage; D008875:Middle Aged; D033303:Protestantism; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires / Q000592:standards*; D044465:White People / Q000706:statistics & numerical data*
chemical_list: D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004044:Dietary Proteins; D018977:Micronutrients