This Book Presents A System Of Critical Appraisal To Help The Reader Evaluate Studies In The Health And Medical Fields, And To Carry Out Their Own Studies More Effectively. The Method Emphasizes The Central Importance Of Cause-and-effect Relationships. Over Several Years, Many Doctors, Nurses, Health Educators, Health Managers, And Students, As Well As Epidemiologists And Researchers, Have Found It Interesting And Useful. The Great Strength Of The Method Is That It Is Applicable To A Wide Range Of Issues, Both To Intervention Trials And Observational Studies-- Provided By Publisher.