19. Epidemiological studies: parameters, design

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  • Epidemiological studies can be classified according to
    • What the aim is
      • Descriptive = describe patterns of disease occurrence in relation to variables
        • Case reports
        • Case series
      • Analytical = test specific hypotheses
        • Ecological studies
        • Cross-sectional studies
        • Case control studies
        • Cohort studies
        • Clinical trials
    • The time period evaluated
      • Retrospective = back in time
      • Concurrent = current point in time
      • Prospective = forward in time
    • Whether interventions were performed
      • Observational = no interventions were performed, only observation
        • Case reports
        • Case series
        • Case control studies
        • Cohort studies
        • Ecological studies
        • Cross-sectional studies
      • Experimental/interventional = interventions or experiments were performed
        • Clinical trial
        • Field trial