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The Scope of Epidemiology
Agent Host and Environment as an Ecological System
The Logic of Multiple Causes
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agent air pollution assumptions attributes birth birthrank bronchitis case-control causal factor causal inference causal models causal relationship cholera cigarette smoking Cohort analysis comparison groups component variable concept confounding variable control variable coronary heart disease death rates defined dependent vari dependent variable disease distorter variable ecological ent variable environment epidemic epidemiology example Exhibit experience exposed exposure Farr frequency genetic global independent variable health disorders herd immunity host hypothesis hypothetical causal variable immunity independent and dependent independent study variable individuals infection initial association instance interaction intervening variable leukemia level of organization low birthweight lung cancer malaria manifestations matched maternal age measure method moderator variable mortality observed association pendent variable persons population predict prevalence random refinement relation research design retardation schistosome schistosomiasis schizophrenia snails social class Source specific statistical Strength of association survey Susser theory third variable time-order tion uncontrolled variance variation