First published in 1986, this landmark text is the definitive guide to clinical trials, written by one of the leading experts in the field. This fully-updated second edition continues to be the most authoritative reference text on randomized clinical trials. It contains a wealth of practical information on the design, conduct, and analysis of both single center and multicenter trials. No other book on clinical trials offers as much detail on such issues as sample size calculation, stratification and randomization, data systems design, development of consent forms, publication policies, preparation of funding requests, and reporting procedures. While the basics of design, conduct, and analysis of clinical trials remain the same, there have been significant changes since the first edition ofClinical Trialswas published two decades ago. In this new edition, the author discusses the refinements and improvements made to methods and procedures, changes in the policies and guidelines underlying trials, as well as requirements for registration of trials. He also discusses current practices for data sharing, for gender representation, for treatment effects monitoring, and for ethical standards of clinical trials. The importance of the randomized controlled trial has grown significantly over time and they are now the cornerstone of all evidence-based medicine. Still rich in tables, checklists, charts, and other resources for the trialist, the second edition ofClinical Trialsis an indispensable reference for clinicians, biostaticians, epidemiologists, and anyone involved in the design and implementation of a clinical trial.