title: Validation of Nutrient Intake Estimates Derived Using a Semi-Quantitative FFQ against 3 Day Diet Records in the Baltimore Longitudinal Study of Aging.
abstract: OBJECTIVE
  To examine the relative validity of a multicultural FFQ used to derive nutrient intake estimates in a community dwelling cohort of younger and older men and women compared with those derived from 3 day (3d) diet records during the same time-frame.
  
  
  METHODS
  Cross-sectional analyses.
  
  
  METHODS
  The Baltimore Longitudinal Study of Aging (BLSA) conducted in the Baltimore, MD and District of Columbia areas.
  
  
  METHODS
  A subset (n=468, aged 26 to 95 years (y), 47% female, 65% non-Hispanic white) from the BLSA, with complete data for nutrient estimates from a FFQ and 3d diet records.
  
  
  METHODS
  Pearson's correlation coefficients (energy adjusted and de-attenuated) for intakes of energy and 26 nutrients estimated from the FFQ and the mean of 3d diet records were calculated in a cross-sectional analysis. Rankings of individuals based on FFQ for various nutrient intakes were compared to corresponding rankings based on the average of the 3d diet records. Bland Altman plots were examined for a visual representation of agreement between both assessment methods. All analyses were stratified by sex and age (above and below 65 y).
  
  
  RESULTS
  Median nutrient intake estimates tended to be higher from the FFQ compared to average 3d diet records. Energy adjusted and de-attenuated correlations between FFQ intake estimates and records ranged from 0.23 (sodium intake in men) to 0.81 (alcohol intake in women). The FFQ classified more than 70 percent of participants in either the same or adjacent quartile categories for all nutrients examined. Bland Altman plots demonstrated good agreement between the assessment methods for most nutrients.
  
  
  CONCLUSIONS
  This FFQ provides reasonably valid estimates of dietary intakes of younger and older participants of the BLSA.
authors.affiliation: Sameera A Talegawkar, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA, sameera.talegawkar@alumni.tufts.edu.
authors.forename: S A
authors.initials: SA
authors.lastname: Talegawkar
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: J E
authors.initials: JE
authors.lastname: Maras
authors.forename: L
authors.initials: L
authors.lastname: Ferrucci
authors.forename: K L
authors.initials: KL
authors.lastname: Tucker
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D015142:Baltimore; D003430:Cross-Sectional Studies; D004032:Diet; D015930:Diet Records; D004034:Diet Surveys / Q000592:standards; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D005502:Food; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D015596:Nutrition Assessment; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*