Adjustment for bias due to errors in exposure assessments in multicenter cohort studies on diet and cancer: a calibration approach

Kaaks, Rudolf; Plummer, Martyn; Riboli, Elio; Estève, Jacques; Staveren, W.A. van

doi:10.1093/ajcn/59.1.245s

Cited by 54 publications

(37 citation statements)

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“…If the aim is to estimate the correlation between dietary questionnaire measurements and individuals' intake levels, a minimum of two additional measurements with independent random errors per person is required (Kaaks et al, 1995). If the aim is limited to estimating the variation in true intake levels actually distinguished by questionnaire measurements (as can be the case in on-going prospective cohort studies) then a`calibration' approach requiring only a single daily intake record or 24 h diet recall per person can be used (Kaaks et al, 1994(Kaaks et al, , 1995. Such an approach is now being implemented in the`European Prospective Investigation into Cancer and Nutrition', a prospective cohort study in progress in nine European countries (Riboli & Kaaks, 1997).…”

Section: Discussionmentioning

confidence: 99%

Reproducibility of a food frequency questionnaire used in the New York University Women’s Health Study: Effect of self-selection by study subjects

et al. 1997

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Objective: The aim of the study was to investigate the reproducibility of a food frequency questionnaire (FFQ) used in a cohort of 14 290 women enrolled in the NYU Women's Health Study. Design: A subset of 474 cohort subjects who completed the dietary questionnaire at baseline (FFQ-1) were approached again on the occasion of a second visit to the mammography study centre and asked to complete the questionnaire a second time (FFQ-2) two to four years after FFQ-1. Two to three months later the questionnaire was mailed to the subjects, and they were asked to complete it a third time (FFQ-3). Setting: A breast cancer screening clinic. Subjects: Of the 474 subjects selected, 100% completed the second questionnaire while only 56% completed and mailed back FFQ-3. This made it possible to compare the long-term reproducibility of dietary intake measurements and baseline dietary habits between the two groups of subjects:`respondents', who agreed to complete the questionnaire a third time, and`non-respondents', who did not. Results: Among respondents (56% of study subjects), energy-adjusted correlation coef®cients for short-term reproducibility between FFQ-2 and FFQ-3 ranged from 0.50±0.64 for nutrients, and from 0.44±0.67 for foods. The long-term reproducibility was lower, ranging from 0.36±0.53 for nutrients, and from 0.31±0.48 for speci®c food groups. Among those who did not respond to FFQ-3, crude correlations for long-term reproducibility, unadjusted for energy intake, were generally lower than among respondents. Nevertheless, after adjustment for energy intake, correlations for long-term reproducibility (FFQ-2 to FFQ-1) were of similar magnitude in both groups. In addition,`non-respondents' reported lower intake of fruit and vegetables and higher intake of meat. Conclusions:The results of this study suggest that subjects who volunteer to participate in substudies on the validity or reproducibility of dietary questionnaire measurements may tend to provide more accurate responses to the questionnaire. The phenomenon seems related more to accuracy of reporting of absolute intake levels than of the relative composition of diet. In addition, self-selection may be associated with differences in dietary habits.

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Section: Discussionmentioning

confidence: 99%

Reproducibility of a food frequency questionnaire used in the New York University Women’s Health Study: Effect of self-selection by study subjects

et al. 1997

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“…The calibration study was conducted to improve the comparability of foodfrequency-derived dietary data across the EPIC centres and to correct for potential measurement errors arising from country-or centre-specific bias and random and systematic within-person errors (Willett, 1998; Ferrari et al, 2004). Previous publications outline in detail the rationale, methodology and population characteristics of the 24-HDR calibration study (Kaaks et al, 1994(Kaaks et al, , 1995Slimani et al, 2002a;Ferrari et al, 2008). Approval for the study was obtained from the ethical review boards of the International Agency for Research on Cancer (Lyon, France) and from all local recruiting institutions.…”

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confidence: 99%

Intake of total, animal and plant proteins, and their food sources in 10 countries in the European Prospective Investigation into Cancer and Nutrition

et al. 2009

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Objective: To describe dietary protein intakes and their food sources among 27 redefined centres in 10 countries participating in the European Prospective Investigation into Cancer and Nutrition (EPIC). Methods: Between 1995 and 2000, 36 034 persons, aged between 35 and 74 years, were administered a standardized 24-h dietary recall (24-HDR) using a computerized interview software programme (EPIC-SOFT). Intakes (g/day) of total, animal and plant proteins were estimated using the standardized EPIC Nutrient Database (ENDB). Mean intakes were adjusted for age, and weighted by season and day of recall. Results: Mean total and animal protein intakes were highest in the Spanish centres among men, and in the Spanish and French centres among women; the lowest mean intakes were observed in the UK health-conscious group, in Greek men and women, and in women in Potsdam. Intake of plant protein was highest among the UK health-conscious group, followed by some of the Correspondence: Dr J Halkjaer, Institute of Cancer Epidemiology, Danish Cancer Society, Strandboulevarden 49, 2100 Copenhagen Ø, Denmark. E-mail: jytteh@cancer.dk Contributors: JH carried out the statistical analysis, prepared the tables and figures and wrote the paper, taking into account comments from all co-authors. NS was the overall coordinator of this project and of the EPIC nutritional databases (ENDB) project. JH, AO, LJB and GD were members of the 'protein working group' and gave input on statistical analyses, drafting of the manuscript and interpretation of results. The other co-authors were local EPIC collaborators involved in the collection of data, and in documenting, compiling and evaluating the subset of their national nutrient databases used in the ENDB. ER is the overall coordinator of the EPIC study. All co-authors provided comments and suggestions on the manuscript and approved the final version. Italian centres and Murcia, whereas Sweden and Potsdam had the lowest intake. Cereals contributed to the highest proportion of plant protein in all centres. The combined intake of legumes, vegetables and fruit contributed to a greater proportion of plant protein in the southern than in the northern centres. Total meat intake (with some heterogeneity across subtypes of meat) was, with few exceptions, the most important contributor to animal protein in all centres, followed by dairy and fish products. Conclusions: This study shows that intake of protein, especially of animal origin, differs across the 10 European countries, and also shows some differences in food sources of protein across Europe.European Journal of Clinical Nutrition (2009) 63, S16-S36; doi:10. 1038/ejcn.2009.73 Keywords: total proteins; animal proteins; plant proteins; EPIC; 24-h dietary recall; ENDB IntroductionDietary protein is an important macronutrient, contributing to around 15-20% of the total dietary energy intake in Western countries (CDC, 2004; Elmadfa and Weichselbaum, 2005).Protein, which contributes essential amino acids, is vital for human metabolism, and protein energ...

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“…Previous publications outline in detail the rationale, methodology and population characteristics of the 24-HDR calibration study (Kaaks et al, 1994(Kaaks et al, , 1995Slimani et al, 2002;Ferrari et al, 2008). In brief, each participant provided a single 24-HDR in a face-to-face interview, except in Norway, where it was obtained by telephone interview (Brustad et al, 2003).…”

Section: Measurements Of Diet and Other Lifestyle Factorsmentioning

confidence: 99%

Energy intake and sources of energy intake in the European Prospective Investigation into Cancer and Nutrition

et al. 2009

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Objectives: To describe energy intake and its macronutrient and food sources among 27 regions in 10 countries participating in the European Prospective Investigation into Cancer and Nutrition (EPIC) study. Methods: Between 1995 and 2000, 36 034 subjects aged 35-74 years were administered a standardized 24-h dietary recall. Intakes of macronutrients (g/day) and energy (kcal/day) were estimated using standardized national nutrient databases. Mean Correspondence: Dr MC Ocké, National Institute for Public Health and the Environment, PO Box 1, 3720 BA, Bilthoven, The Netherlands. E-mail: marga.ocke@rivm.nl Guarantor: MC Ocké. Contributors: MO carried out statistical analysis, prepared tables and figures and wrote the paper, taking into account comments from all co-authors. NS was the overall coordinator of this project and of the EPIC nutritional databases (ENDB) project. MO, NS, NL, SG, SB, PF, SS, VB, JL and EW were members of the writing group and gave input on statistical analysis, drafting of the paper and interpretation of results. The other co-authors were local EPIC collaborators involved in the collection of data, and in documenting, compiling and evaluating the subset of their national nutrient databases used in the ENDB. ER is the overall coordinator of the EPIC study. All co-authors provided comments and suggestions on the paper and approved the final version. intakes were weighted by season and day of the week and were adjusted for age, height and weight, after stratification by gender. Extreme low-and high-energy reporters were identified using Goldberg's cutoff points (ratio of energy intake and estimated basal metabolic rate o0.88 or 42.72), and their effects on macronutrient and energy intakes were studied. Results: Low-energy reporting was more prevalent in women than in men. The exclusion of extreme-energy reporters substantially lowered the EPIC-wide range in mean energy intake from 2196-2877 to 2309-2866 kcal among men. For women, these ranges were 1659-2070 and 1873-2108 kcal. There was no north-south gradient in energy intake or in the prevalence of low-energy reporting. In most centres, cereals and cereal products were the largest contributors to energy intake. The food groups meat, dairy products and fats and oils were also important energy sources. In many centres, the highest mean energy intakes were observed on Saturdays. Conclusions: These data highlight and quantify the variations and similarities in energy intake and sources of energy intake among 10 European countries. The prevalence of low-energy reporting indicates that the study of energy intake is hampered by the problem of underreporting.

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Adjustment for bias due to errors in exposure assessments in multicenter cohort studies on diet and cancer: a calibration approach

Cited by 54 publications

References 20 publications

Reproducibility of a food frequency questionnaire used in the New York University Women’s Health Study: Effect of self-selection by study subjects

Reproducibility of a food frequency questionnaire used in the New York University Women’s Health Study: Effect of self-selection by study subjects

Intake of total, animal and plant proteins, and their food sources in 10 countries in the European Prospective Investigation into Cancer and Nutrition

Energy intake and sources of energy intake in the European Prospective Investigation into Cancer and Nutrition

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