The dynamics of disease transmission -- Measuring the occurrence of disease : I. morbidity -- Measuring the occurrence of disease : II. mortality -- Assessing the validity and reliability of diagnostic and screening tests -- The natural history of disease : ways of expressing prognosis -- Assessing the efficacy of preventive and therapeutic measures: randomized trials -- Randomized trials : some further issues -- Cohort studies -- Case-control studies and other study designs -- Estimating risk : is there an association? -- More on risk : estimating the potential for prevention -- A pause for review : comparing cohort and case-control studies -- From association to causation : deriving inferences from epidemiologic studies -- More on causal inferences : bias, confounding, and interaction -- Identifying the roles of genetic and environmental factors in disease causation -- Applying epidemiology to evaluation and policy -- Using epidemiology to evaluate health services -- The epidemiologic approach to evaluating screening programs -- Epidemiology and public policy -- Ethical and professional issues in epidemiology.