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

Published online by Cambridge University Press:  16 October 2007

Meera G Jain ,
Thomas E Rohan ,
Colin L Soskolne  and
Nancy Kreiger
Meera G Jain*
Affiliation:
Department of Public Health Sciences, 12 Queen's Park Crescent West, University of Toronto, Toronto, Ontario, M5S 1A8, Canada
Thomas E Rohan
Affiliation:
Department of Epidemiology and Social Medicine, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
Colin L Soskolne
Affiliation:
Department of Public Health Sciences, 13–103 Clinical Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada
Nancy Kreiger
Affiliation:
Research Unit, Division of Preventive Oncology, Cancer Care Ontario, 620 University Avenue, Toronto, Ontario, M5G 2L7, Canada
*
*Corresponding author: Email [email protected]
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Abstract

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Objective:

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.

Methods:

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.

Results:

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.

Conclusions:

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.

Keywords

CalibrationDiet methodsFood-frequency questionnairesValidation
Type
Research Article
Information
Public Health Nutrition , Volume 6 , Issue 1 , February 2003 , pp. 79 - 86
Copyright
Copyright © CABI Publishing 2003

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