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What is the appropriate measure of relative risk for a cohort study?

Confidence interval

Sample size determination

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Open access•Journal Article•DOI Methods for Estimating Adjusted Risk Ratios Peter Cummings 01 Aug 2009-Stata Journal 270 Citations	The risk ratio can be a useful statistic for summarizing the results of cross-sectional, cohort, and randomized trial studies.
Journal Article•DOI Improving estimates of event incidence over time in populations exposed to other events: application to three large databases. Corinne Alberti, Fabien Métivier, Paul Landais, Eric Thervet, Christophe Legendre, Sylvie Chevret - Show less +5 more 01 Jun 2003-Journal of Clinical Epidemiology 50 Citations	A competing-risk approach must be used to analyze the risk of events other than death in cohort studies, particularly when mortality rates are high.
Journal Article•DOI A Review of Methodological Issues of the Standardized Mortality Ratio (SMR) in Occupational Cohort Studies Shan Pou Tsai, C P Wen - Show less +1 more 01 Mar 1986-International Journal of Epidemiology 60 Citations	It is suggested that the summary statistics of a cohort mortality experience should include relative risk, attributable risk, and life expectancy.
Journal Article•DOI Long-term mortality study of oil refinery workers: V. Comparison of workers hired before, during, and after World War II (1940-1945) with a discussion of the impact of study designs on cohort results. C. P. Wen, Shan P. Tsai, N. S. Weiss, R. L. Gibson - Show less +3 more 01 Jan 1986-American Journal of Industrial Medicine 16 Citations	Given the same cohort method (historical prospective), cohort results vary widely according to different study designs, and this has implications for "generalizable" risk assessment or risk projections.
Journal Article•DOI Estimation of a common risk ratio in stratified case‐cohort studies Tosiya Sato 01 Jan 1992-Statistics in Medicine 19 Citations	The case-cohort study design is a useful modification of the case-control design, which allows direct estimation of the risk ratio without the rare-disease assumption.
Journal Article•DOI Power and sample size for testing homogeneity of relative risks in prospective studies. Jun-Mo Nam 01 Mar 1999-Biometrics 15 Citations	Results of this paper may be useful in assessing the validity of the model of a common relative risk before combining several 2 x 2 tables or in designing a prospective study for detecting heterogeneity of relative risks.
Journal Article•DOI Sample Size Requirements for Calibration Studies of Dietary Intake Measurements in Prospective Cohort Investigations Rudolf Kaaks, Elio Riboli, Wija A. van Staveren - Show less +2 more 01 Sep 1995-American Journal of Epidemiology 24 Citations	If there is reasonable agreement between cohort-specific relative risk estimates, a more powerful pooled summary estimate can be obtained.

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What is excess relative risk?3 answersExcess relative risk (ERR) is a measure used to quantify the association between exposure and disease. It involves both difference and ratio operations and is estimable in case-control studies. The ERR index remains constant across strata in a rare-disease case-control setting and can be regarded as a common effect parameter. It can be used to estimate attributable fraction indices with greater precision. The ERR index preserves the logical properties of ratio-type indices and is advocated for use as an effect measure in case-control studies of rare diseases. A Bayesian Poisson relative risk model can be used to display the excess relative risk associated with a unique exposure as a probability distribution in closed form. The relative excess risk is an alternative comparative measure that removes the background risk and applies to situations where an "unexposed" reference group is included.

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