Process / pipelineClinical / epidemiology
Cohort Study — Longitudinal Observational Design
A cohort study assembles a group of individuals who share a common starting point — typically freedom from the outcome of interest — and follows them over time to observe who develops the outcome. By comparing incidence rates between exposed and unexposed subgroups, researchers can estimate relative risk and absolute risk differences. Cohort studies are the gold-standard observational design for measuring disease incidence and establishing temporal relationships between exposure and outcome.
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Sources
- Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641
- Doll, R., & Hill, A. B. (1954). The mortality of doctors in relation to their smoking habits: a preliminary report. British Medical Journal, 1(4877), 1451–1455. DOI: 10.1136/bmj.1.4877.1451 ↗
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Adaptive Case-Control StudyAdaptive Cohort StudyAdaptive nested case-controlAdaptive Phase IV studyBayesian Case SeriesBayesian Cohort StudyBayesian nested case-controlBayesian Screening Test EvaluationCase seriesCase-control studyCase-crossover designCox proportional hazardsCross-sectional epidemiological studyDose-Response AnalysisEcological StudyKaplan-Meier AnalysisLongitudinal Cross-Sectional ResearchLongitudinal Structured InterviewLongitudinal SurveyMatched case reportMatched case-control studyMatched Cohort StudyMatched Cross-Sectional Epidemiological StudyMatched Diagnostic Accuracy StudyMatched dose-response analysisMatched ecological studyMatched nested case-controlMatched Phase IV StudyMeta-analytic Cohort StudyMeta-analytic Nested Case-ControlMeta-analytic Phase IV StudyMulticenter cohort studyMulticenter Ecological StudyMulticenter Nested Case-ControlMulticenter Randomized Clinical TrialNested case-controlPanel-based Causal-Comparative ResearchPanel-based Cohort ResearchPanel-based correlational researchPanel-based cross-sectional researchPanel-based ex post facto designPanel-based exploratory quantitative researchPanel-based Observational Quantitative ResearchPanel-based trend researchPhase III clinical trialPhase IV studyPragmatic case seriesPragmatic case-control studyPragmatic Cross-Sectional Epidemiological StudyPragmatic diagnostic accuracy studyPragmatic Dose-Response AnalysisPragmatic ecological studyPragmatic nested case-controlPragmatic phase IV studyPragmatic randomized clinical trialPragmatic Screening Test EvaluationProspective Case SeriesProspective Case-Control StudyProspective Cohort StudyProspective Diagnostic Accuracy StudyProspective Ecological StudyProspective Nested Case-ControlProspective Phase IV StudyProspective Randomized Clinical TrialProspective Screening Test EvaluationRandomized clinical trialRetrospective case-control studyRetrospective Cohort StudyRetrospective nested case-controlRisk-adjusted case-control studyRisk-adjusted cohort studyRisk-adjusted diagnostic accuracy studyRisk-adjusted dose-response analysisRisk-adjusted ecological studyRisk-adjusted Nested Case-ControlRisk-adjusted Phase IV studyScreening Test Evaluation