Titre :
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Reproducibility measures and their effect on diet-cancer associations in the Boyd Orr cohort. (2007)
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Auteurs :
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FROBISHER (Clare) : GBR. Department of Public Health and Epidemiology. Public Health Building. University of Birmingham. Edgbaston Birmingham. ;
Pauline-M EMMETT ;
Stephen-J FRANKEL ;
David-J GUNNELL ;
MAYNARD (Maria) : GBR. Mrc Social and Public Health Sciences Unit. Glasgow. ;
Andrew-R NESS ;
George-Davey Smith ;
Kate TILLING ;
University of Bristol. Department of Community Based Medicine. Unit of Paediatric and Perinatal Epidemiology. Bristol. GBR
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Type de document :
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Article
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Dans :
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Journal of epidemiology and community health (vol. 61, n° 5, 2007)
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Pagination :
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434-440
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Langues:
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Anglais
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Mots-clés :
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Cancer
;
Régime alimentaire
;
Association
;
Homme
;
Alimentation
;
Ecosse
;
Grande Bretagne
;
Royaume Uni
;
Europe
;
Angleterre
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Résumé :
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[BDSP. Notice produite par INIST-CNRS TR0x969F. Diffusion soumise à autorisation]. Objectives : To quantify measurement error in the estimation of family diet intakes using 7-day household food inventories and to investigate the effect of measurement-error adjustment on diet-disease associations. Design and setting : Historical cohort study in 16 districts in England and Scotland, between 1937 and 1939. Subjects : 4999 children from 1352 families in the Carnegie Survey of Diet and Health. 86.6% of these children were traced as adults and form the Boyd Orr cohort. The reproducibility analysis was based on 195 families with two assessments of family diet recorded 3-15 months apart. Methods : Intraclass correlation coefficients (ICCs) were calculated for a variety of nutrients and food groups. Diet-cancer associations reported previously in the Boyd Orr cohort were reassessed using two methods : (a) the ICC and (b) the regression calibration. Main results : The ICCs for the dietary intakes ranged from 0.44 (bêta carotene) to 0.85 (milk and milk products). The crude fully adjusted hazard ratio (HR) for cancer mortality per 1 MJ/day increase in energy intake was 1.15 (95% Cl 1.06 to 1.24). After adjustment using the ICC for energy (0.80) the HR (95% Cl) increased to 1.19 (1.08 to 1.31), and the estimate from regression calibration was 1.14 (0.98 to 1.32). The crude fully adjusted odds ratio (OR) for cancer incidence per 40 g/day increase in fruit intake was 0.84 (95% Cl 0.73 to 0.97). After adjustment using the fruit ICC (0.78) it became 0.81 (0.67 to 0.96) and the OR derived from regression calibration was 0.81 (0.59 to 1.10). Conclusions : The diet-disease relationships for the dietary intakes with low measurement error were robust to adjustment for measurement error.
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