Measurement error in the exposure under investigation is an important but often ignored source of bias in observational studies.
The authors examined the impact of measurement error in the association between total serum cholesterol and 16-year coronary heart disease and all-cause mortality in a cohort of 6,137 middle-aged men of Japanese descent in the Honolulu Heart Program (1973-1988).
A Cox regression model that enables modeling of survival time with correction for measurement errors in multiple covariates was employed.
After controlling for age, body mass index, systolic blood pressure, smoking status, alcohol consumption, dietary cholesterol, and total calorie intake, a difference of one standard deviation (38 mg/dL) in total cholesterol was associated with a significant increase in the risk of coronary disease death (uncorrected hazard ratio=1.35).
After correction for measurement errors in total cholesterol and covariates (except smoking and age), the estimated hazard ratio increased to 1.65 (a 22% increase).
A U-shaped relation was observed between total cholesterol levels and the risk of all-cause mortality.
This association was then examined with a quadratic model and with a two-slope or V-shaped regression model.
In the quadratic fit, the magnitude of the quadratic total cholesterol term increased threefold after the adjustment for measurement error.
In the V fit, the hazard ratio of all-cause death corresponding to a change in one standard dev...
Mots-clés Pascal : Cardiopathie coronaire, Mortalité, Adolescent, Homme, Epidémiologie, Etude cohorte, Cholestérol, Biais méthodologique, Japon, Asie, Erreur mesure, Santé publique, Modèle statistique, Appareil circulatoire pathologie, Lipide
Mots-clés Pascal anglais : Coronary heart disease, Mortality, Adolescent, Human, Epidemiology, Cohort study, Cholesterol, Methodological bias, Japan, Asia, Measurement error, Statistical model, Cardiovascular disease, Lipids
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Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0171860
Code Inist : 002B12A03. Création : 199608.