title: Validity and calibration of food frequency questionnaires used with African-American adults in the Jackson Heart Study.
abstract: OBJECTIVE
  To examine the relative validity of two food frequency questionnaires (FFQs) developed for use in investigating diet and disease relationships within the adult African-American population in the southern United States.
  
  
  METHODS
  Cross-sectional analyses of dietary nutrient intake data, comparing four 24-hour dietary recalls with an FFQ developed by the Lower Mississippi Delta Nutrition Intervention Research Initiative, and its shorter version adapted for use in the Jackson Heart Study.
  
  
  METHODS
  A representative subset of participants (n=499, aged 35 to 81 years) from the baseline Jackson Heart Study cohort (N=5,302) was selected for this study. Data collection took place between winter 2000 and spring 2004.
  
  
  METHODS
  Pearson's correlation coefficients (energy adjusted and de-attenuated) for 26 nutrients estimates from each of the FFQs, comparing them with the mean of four 24-hour dietary recalls. The ability of the FFQs to rank individuals based on nutrient intakes was compared to that of the mean of four 24-hour dietary recalls and attenuation coefficients were also calculated.
  
  
  RESULTS
  Median nutrient intake estimates tended to be higher on the long and lower on the short FFQ compared to the median for the mean of four 24-hour dietary recalls. Energy adjusted and deattenuated correlations of FFQ intake estimates with recalls ranged from 0.20 for sodium to 0.70 for carbohydrate for the short FFQ and from 0.23 for polyunsaturated fat to 0.75 for dietary fiber and magnesium for the long. Attenuation coefficients for men on average were 0.42 for the short and 0.49 for the long FFQ. For women, these were 0.31 for the short and 0.42 for the long FFQ.
  
  
  CONCLUSIONS
  Both FFQs appear to be reasonably valid for assessment of dietary intake of adult African Americans in the South. The Lower Mississippi Delta Nutrition Intervention Research Initiative FFQ exhibited higher intake estimates and stronger correlations with recalls than the Jackson Heart Study FFQ for most nutrients analyzed, more so for women than men.
authors: Department of Family and Consumer Sciences, The University of Mississippi, University, USA.
authors: Teresa C
authors: TC
authors: Carithers
authors: Sameera A
authors: SA
authors: Talegawkar
authors: Marjuyua L
authors: ML
authors: Rowser
authors: Olivia R
authors: OR
authors: Henry
authors: Patricia M
authors: PM
authors: Dubbert
authors: Margaret L
authors: ML
authors: Bogle
authors: Herman A
authors: HA
authors: Taylor
authors: Katherine L
authors: KL
authors: Tucker
mesh_terms: D000328:Adult; D001741:Black or African American; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D002138:Calibration; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D004032:Diet / Q000706:statistics & numerical data*; D004034:Diet Surveys; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D008922:Mississippi; D015596:Nutrition Assessment; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017678:Sex Distribution; D011795:Surveys and Questionnaires / Q000592:standards*