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

  • Karen Jaceldo-Siegl (a1) (a2), Jing Fan (a2), Joan Sabaté (a1) (a3), Synnove F Knutsen (a3), Ella Haddad (a1), W Lawrence Beeson (a3), R Patti Herring (a4), Terrence L Butler (a3), Hannelore Bennett (a2) and Gary E Fraser (a3) (a2)...
Abstract
AbstractObjective

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

Design

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.

Setting

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

Subjects

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

Results

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.

Conclusions

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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Corresponding author
*Corresponding author: Email kjaceldo@llu.edu
Linked references
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1.W Willett (1998) Food frequency methods. In Nutritional Epidemiology, 2nd ed., pp. 74100 [W Willett, editor]. New York: Oxford University Press.

5.W Willett & E Lenart (1998) Reproducibility and validity of food-frequency questionnaires. In Nutritional Epidemiology, 2nd ed., pp. 101147 [W Willett, editor]. New York: Oxford University Press.

8.B Efron & RJ Tibshirani (1993) Better bootstrap intervals. In An Introduction to the Bootstrap, pp. 184188. New York: Chapman and Hall.

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Public Health Nutrition
  • ISSN: 1368-9800
  • EISSN: 1475-2727
  • URL: /core/journals/public-health-nutrition
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