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The purpose and methods of epidemiology
8 Analysis and presentation of findings
aetiology affected age and sex age distribution age-group age/sex analysis analytic studies associated attend birthweight cancer cards cent Chapter clinic Cluster sampling cohort studies comparison control group deaths defined descriptive studies determine developing countries diagnosis disease frequency disease incidence disorder district of Uganda doctor epidemiological epilepsy error ethnic group example experimental population exposed exposure female Figure forceps delivery frequency distribution hookworm hospital identification incidence rate individuals influences interview investigator kwashiorkor lesions maize males method mortality rates necessary nutritional observations obtained occupation occur patient-control studies patients pellagra persons prevalence preventive measure preventive trials procedure punched cards random sample records shows simple random sample smallpox specific spleen rates staff standard deviation standardised statistical stillbirths Stratified sampling study and control study group study population systematic sample techniques tion trachoma tuberculosis Uganda ulcers usually vaccine values variables or attributes variation villages