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Calibration of the dietary questionnaire for the Canadian Study of Diet, Lifestyle and Health cohort

  • Meera G Jain (a1), Thomas E Rohan (a2), Colin L Soskolne (a3) and Nancy Kreiger (a4)

For proper interpretation of results from epidemiological studies that use food-frequency questionnaires (FFQs), it is necessary to know the relationship between reported intakes from the FFQ and true usual intake. In this paper, we report a calibration study conducted to investigate the performance of the FFQ used in a cohort study, the Canadian Study of Diet, Lifestyle and Health.


Over a 1-year period, 151 men and 159 women completed a full set of questionnaires including a self-administered baseline FFQ, three 24-hour diet recalls administered by telephone, and a second FFQ self-administered subsequently. The association between the nutrient estimates derived from the FFQs and the diet recalls was evaluated by calculating deattenuated Pearson's correlation coefficients.


The FFQs estimated mean daily nutrient intakes higher than the diet recalls. When the log-transformed and energy-adjusted nutrient intakes from the average of three 24-hour recalls were compared against the baseline FFQ, the following deattenuated correlations were obtained in men and women, respectively: total energy 0.44 and 0.32, total fat 0.64 and 0.68, saturated fat 0.68 and 0.70, dietary fibre 0.65 and 0.44, vitamin E 0.32 and 0.37, vitamin C 0.40 and 0.37, β-carotene 0.34 and 0.29, alcohol 0.74 and 0.67, caffeine 0.81 and 0.76, with a median correlation of 0.49 and 0.53. Correlations between the second FFQ and diet recalls were similar. The correlations between the two FFQs as a test of reliability had a median value 0.64 for men and 0.63 for women for selected nutrients.


The study suggests that the FFQ method gives acceptable levels of nutrients or food component estimates, as assessed by this calibration study against diet recalls, when limited to energy-adjusted and deattenuated values.

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1DO Stram , JH Hankin , LR Wilkens , Calibration of the dietary questionnaire for a multiethnic cohort in Hawaii and Los Angeles. Am. J. Epidemiol. 2000; 151: 358–70.

3. W Willett . Nutritional Epidemiology. New York: Oxford University Press, 1998.

3. W Willett . Nutritional Epidemiology. New York: Oxford University Press, 1998.

5R Kaaks , E Riboli . Validation and calibration of dietary intake measurements in the EPIC project: methodological considerations. Int. J. Epidemiol. 1997; 26(Suppl. 1): S15–25.

8M Jain , GR Howe , T Rohan . Dietary assessment in epidemiology: comparison of a food frequency and a diet history questionnaire with 7-day food records. Am. J. Epidemiol. 1996; 143: 953–60.

10AR Mangels , JM Holden , GR Beecher , The carotenoid content of fruits and vegetables: an evaluation of analytic data. J. Am. Diet. Assoc. 1993; 93: 284–96.

19R Kaaks , N Slamani , E Riboli . Pilot phase studies on the accuracy of dietary intake measurements in the EPIC project: overall evaluation of results. Int. J. Epidemiol. 1997; 26: S26–36.

20AE Black . Physical activity levels from a meta-analysis of doubly labeled water studies for validating energy intake as measured by dietary assessment. Nutr. Rev. 1996; 54: 170–4.

22AF Subar , FE Thompson , V Kipnis , Comparative validation of the Block, Willett, and National Cancer Institute food frequency questionnaires: the Eating at America's Table Study. Am. J. Epidemiol. 2001; 154(12): 1089–99.

26D Thomas , D Stram , J Dwyer . Exposure measurement error: influence on exposure–disease relationships and methods of correction. Ann. Public Health 1993; 14: 6993.

27AE Black , AM Prentice , G Goldberg , Measurements of total energy expenditure provide insights into the validity of dietary measurements of energy intake. J. Am. Diet. Assoc. 1993; 93: 572–9.

30B Rosner , W Willett , D Spiegelman . Correction of logistic regression relative risk estimates and confidence intervals for systematic within-person measurement error. Stat. Med. 1989; 8: 1051–69.

31M Jain , J McLaughlin . Validity of nutrient estimates by food frequency questionnaires based either on exact frequencies or categories. Ann. Epidemiol. 2000; 10: 354–60.

33V Kipnis , D Midthune , LS Freedman , Empirical evidence of correlated biases in dietary assessment instruments and its implications. Am. J. Epidemiol. 2001; 153(4): 394403.

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