BACKGROUND: A self-administered food frequency questionnaire was developed for the Dutch cohort of the European Prospective Investigation into Cancer and Nutrition (EPIC). Habitual consumption of 178 food items can be calculated from the questionnaire data. METHODS: Reproducibility and relative validity for food group intake were investigated in a population of 121 Dutch men and Women. The questionnaire was administered three times at 6-month intervals in order to determine the reproducibility. To assess the relative validity 12 monthly 24-hour recalls served as the reference method. RESULTS: Spearman rank order correlation coefficients between estimates of food group intake assessed by repeated questionnaires ranged from 0.45 to 0.92. For men, Spearman correlation coefficients between estimates of food group intake based on the questionnaire and those based on 24-hour recalls ranged from 0.21 for cooked vegetables to 0.78 for sugar and sweet products, with a range of 0.61. For women the median was 0.53, with a minimum of 0.31 for vegetables and a maximum of 0.87 for alcoholic beverages. The photographs in the questionnaire for the estimation of portion sizes contributed little to the relative validity of the ranking of subjects. However, on the group level most median food group estimates based on photographic portion sizes were closer to the median intakes as assessed by 24-hour recalls than those based on standard portion sizes. CONCLUSIONS: The questionnaire seems adequate for ranking Dutch EPIC subjects according to intake of most food groups, although the relative validity for some food groups, such as vegetables and fish, remains of concern.
BACKGROUND: A self-administered food frequency questionnaire was developed for the Dutch cohort of the European Prospective Investigation into Cancer and Nutrition (EPIC). Habitual consumption of 178 food items can be calculated from the questionnaire data. METHODS: Reproducibility and relative validity for food group intake were investigated in a population of 121 Dutch men and Women. The questionnaire was administered three times at 6-month intervals in order to determine the reproducibility. To assess the relative validity 12 monthly 24-hour recalls served as the reference method. RESULTS: Spearman rank order correlation coefficients between estimates of food group intake assessed by repeated questionnaires ranged from 0.45 to 0.92. For men, Spearman correlation coefficients between estimates of food group intake based on the questionnaire and those based on 24-hour recalls ranged from 0.21 for cooked vegetables to 0.78 for sugar and sweet products, with a range of 0.61. For women the median was 0.53, with a minimum of 0.31 for vegetables and a maximum of 0.87 for alcoholic beverages. The photographs in the questionnaire for the estimation of portion sizes contributed little to the relative validity of the ranking of subjects. However, on the group level most median food group estimates based on photographic portion sizes were closer to the median intakes as assessed by 24-hour recalls than those based on standard portion sizes. CONCLUSIONS: The questionnaire seems adequate for ranking Dutch EPIC subjects according to intake of most food groups, although the relative validity for some food groups, such as vegetables and fish, remains of concern.
Authors: Tricia M McKeever; Sarah A Lewis; Patricia A Cassano; Marga Ocké; Peter Burney; John Britton; Henriette A Smit Journal: Am J Clin Nutr Date: 2010-06-16 Impact factor: 7.045
Authors: Marit M E van Bakel; Nadia Slimani; Edith J M Feskens; Huaidong Du; Joline W J Beulens; Yvonne T van der Schouw; Furio Brighenti; Jytte Halkjaer; Anne E Cust; Pietro Ferrari; Jennie Brand-Miller; H Bas Bueno-de-Mesquita; Petra Peeters; Eva Ardanaz; Miren Dorronsoro; Francesca L Crowe; Sheila Bingham; Sabine Rohrmann; Heiner Boeing; Ingegerd Johansson; Jonas Manjer; Anne Tjonneland; Kim Overvad; Eiliv Lund; Guri Skeie; Amalia Mattiello; Simonetta Salvini; Françoise Clavel-Chapelon; Rudolf Kaaks Journal: J Nutr Date: 2009-01-21 Impact factor: 4.798
Authors: S van Dieren; C S P M Uiterwaal; Y T van der Schouw; D L van der A; J M A Boer; A Spijkerman; D E Grobbee; J W J Beulens Journal: Diabetologia Date: 2009-09-01 Impact factor: 10.122
Authors: Linda M Oude Griep; Johanna M Geleijnse; Daan Kromhout; Marga C Ocké; W M Monique Verschuren Journal: PLoS One Date: 2010-10-25 Impact factor: 3.240
Authors: Clara C Elbers; Carolien G F de Kovel; Yvonne T van der Schouw; Juliaan R Meijboom; Florianne Bauer; Diederick E Grobbee; Gosia Trynka; Jana V van Vliet-Ostaptchouk; Cisca Wijmenga; N Charlotte Onland-Moret Journal: PLoS One Date: 2009-09-17 Impact factor: 3.240