手法を比較

	リスク調整済み生態学的研究	生態学的研究
分野	疫学	疫学
系統	Process / pipeline	Process / pipeline
提唱年	1980s–1990s	19th century (Snow 1854); formalised mid-20th century
提唱者	Extension of ecological study methodology; risk adjustment concepts formalized by Morgenstern (1982) and developed further in health outcomes research	Various; foundational work by John Snow (1854) and systematised in modern form by Brian MacMahon and colleagues
種類	Observational ecological design with statistical confounding control	Observational epidemiological study
原典	Morgenstern, H. (1982). Uses of ecologic analysis in epidemiologic research. American Journal of Public Health, 72(12), 1336–1344.	Morgenstern, H. (1995). Ecologic studies in epidemiology: concepts, principles, and methods. Annual Review of Public Health, 16(1), 61–81.
別名	risk-adjusted ecological analysis, confounder-adjusted ecological study, ecological regression with risk adjustment, adjusted area-level study	aggregate study, correlational study, ecological correlation study, population-level study
関連	4	5
概要	A risk-adjusted ecological study is an observational epidemiological design that examines associations between exposures and outcomes measured at the group or area level — such as regions, hospitals, or countries — while statistically controlling for known risk factors also measured at that level. By incorporating risk adjustment through ecological regression or standardization, the design reduces (though cannot eliminate) confounding from group-level variables, enabling more valid comparisons across populations or settings.	An ecological study is an observational epidemiological design in which the unit of analysis is a group or population — a country, region, city, or time period — rather than an individual. Exposures and outcomes are measured as aggregates (rates, proportions, or means) and then correlated across groups to generate or evaluate hypotheses about population-level associations between risk factors and disease.