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adjustment alcohol areas atherosclerosis bacteria blood calculated cancer case-control study causation cause census Center for Health cervical cancer Chapter cholera cholesterol clinical concept condition contaminated control group County death rate developed drug environment Epidemic typhus epidemiologic methods epidemiology example experimental exposed fetal deaths Figure fluoridation foodborne illness germ theory Health Promotion Health Statistics health status heart disease hepatitis Hippocrates hospital human hypertension identified illness immunity incidence rates included individual infant infected infectious diseases instance investigator leptospirosis live births lung cancer measles measures mental morbidity mortality rate myocardial infarction Number of deaths Number of live number of persons occurred onset Pasteur percent period physicians point epidemic population postneonatal potential hosts prevalence problem Public Health puerperal fever rabies random randomized controlled trial ratio Recommended Reading result risk factors sample smoking social strategies stress Survey symptoms term vital statistics water fluoridation women