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The purpose and methods of epidemiology
Making observations and counting diseases
Populations and samples
10 other sections not shown
Africa age-group age/sex analysis associated attending bednets birth birthweight calculated cancer case-control study changes clinic cluster cluster samples cohort studies comparison control group death defined developing countries diagnosis disease frequency disease incidence disorder effectiveness ensure epidemic epidemiological epidemiological studies error examination example experimental population exposure female Glycosuria health services hookworm hospital household identify immunization incidence rates individuals infection infectious disease influences interview investigator kwashiorkor lation leprosy maize malaria males Mantoux test method necessary nutritional observations obtained occupation occur particular patients pellagra person poliomyelitis popu pre-coded prevalence preventive measure preventive trial problems procedure proportion random record form sample schistosomiasis selected shows specific spleen spleen rates sputum staff standard statistical stillbirths study and control study group study population survey suspected determinant systematic sample Table techniques tetanus trachoma usually vaccine values variation villages workers