Suggestions for improving the reporting of observational epidemiologic studies are to be encouraged, but we believe the required use in reports of a checklist of design and analytic features relevant to study quality would have detrimental consequences.
From the *Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts; †Department of Epidemiology, University of Washington; Seattle, Washington; ‡Fred Hutchinson Cancer Research Center; Seattle, Washington.
Editors' note: Related articles appear on pages 789, 792, 794, 797, 800, and 805.
Correspondence: Brian MacMahon, Department of Epidemiology, Harvard School of Public Health, Boston, MA. E-mail: firstname.lastname@example.org.