To adjust or not in studies on racial differences in hormone concentrations? Depends on the question!

Rohrmann S Division of Cancer Epidemiology and Prevention (S.R.), Institute of Social and Preventive Medicine, University of Zurich, 8001 Zurich, Switzerland; Department of Epidemiology (E.A.P.), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205; Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins (E.A.P.), Baltimore, Maryland 21231; and James Buchanan Brady Urological Institute (E.A.P.), Johns Hopkins Medical Institutions, Baltimore, Maryland 21287.
Platz EA