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Public Health Nutr. 2011 Nov;14(11):1988-97. doi: 10.1017/S1368980011000735. Epub 2011 May 6.

Race-specific validation of food intake obtained from a comprehensive FFQ: the Adventist Health Study-2.

Author information

  • 1Department of Nutrition, School of Public Health, Loma Linda University, 24785 Stewart Street, EH 203, Loma Linda, CA 92350, USA. kjaceldo@llu.edu

Erratum in

  • Public Health Nutr. 2012 Nov;15(11):2165-6.



To assess race-specific validity of food and food group intakes measured using an FFQ.


Calibration study participants were randomly selected from the Adventist Health Study-2 (AHS-2) cohort by church, and then by subject-within-church. Intakes of forty-seven foods and food groups were assessed using an FFQ and then compared with intake estimates measured using six 24 h dietary recalls (24HDR). We used two approaches to assess the validity of the questionnaire: (i) cross-classification by quartile and (ii) de-attenuated correlation coefficients.


Seventh-day Adventist church members geographically spread throughout the USA and Canada.


Members of the AHS-2 calibration study (550 whites and 461 blacks).


The proportion of participants with exact quartile agreement in the FFQ and 24HDR averaged 46 % (range: 29-87 %) in whites and 44 % (range: 25-88 %) in blacks. The proportion of quartile gross misclassification ranged from 1 % to 11 % in whites and from 1 % to 15 % in blacks. De-attenuated validity correlations averaged 0·59 in whites and 0·48 in blacks. Of the forty-seven foods and food groups, forty-three in whites and thirty-three in blacks had validity correlations >0·4.


The AHS-2 questionnaire has good validity for most foods in both races; however, validity correlations tend to be higher in whites than in blacks.

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