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	Matched ekologisk studie	Matchad kohortstudie
Ämnesområde	Epidemiologi	Epidemiologi
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1970s–1990s (methodological consolidation)	Mid-20th century; propensity-score variant 1983
Upphovsperson	Extension of classical ecological study design; matching principles formalized in 20th-century epidemiology	Established practice; propensity-score matching formalized by Rosenbaum & Rubin (1983)
Typ	Observational study design	Observational analytic study design
Ursprungskälla	Morgenstern, H. (1998). Ecologic studies in epidemiology: Concepts, principles, and methods. Annual Review of Public Health, 16, 61–81.	Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641
Alias	matched ecologic study, geographically matched ecological study, area-matched ecological design, matched aggregate study	matched follow-up study, paired cohort study, propensity-matched cohort, matched prospective study
Närliggande	6	5
Sammanfattning	A matched ecological study is an observational epidemiological design in which aggregate units — such as geographic areas, communities, or time periods — are systematically paired or matched on key characteristics before comparing exposure and outcome rates. Matching at the group level controls for area-level confounders and improves comparability between exposed and unexposed units, producing more credible estimates of ecological associations than an unmatched counterpart.	A matched cohort study is an observational design in which each exposed participant is paired with one or more unexposed counterparts who share key characteristics — such as age, sex, or comorbidity status — before both groups are followed forward in time to compare incident outcomes. Matching controls for measured confounders at the design stage, reducing bias that would otherwise require statistical adjustment alone.