Methods for the Selection of Covariates in Nutritional Epidemiology Studies: A Meta-Epidemiological Review

Observational studies provide important information about the effects of exposures that cannot be easily studied in clinical trials, such as nutritional exposures, but are subject to confounding. Investigators adjust for confounders by entering them as covariates in analytic models.The aim of this study was to evaluate the reporting and credibility of methods for selection of covariates in nutritional epidemiology studies.We sampled 150...