방법 비교

	일치형 중첩 환자-대조 연구	코호트 연구
분야	역학	역학
계열	Process / pipeline	Process / pipeline
기원 연도	1970s	Mid-20th century (formal epidemiological design codified ~1950s)
창시자	Mantel (1973), Thomas (1977); formalized by Breslow & Day (1980)	Doll & Hill (British Doctors Study, 1951); Snow (cholera, 1854)
유형	Observational analytic study design	Observational longitudinal study design
원전	Rothman, K.J., Greenland, S., & Lash, T.L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641	Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641
별칭	matched NCC study, nested case-control with matching, matched risk-set sampling, incidence density matched case-control	longitudinal study, follow-up study, panel study, incidence study
관련	5	6
요약	A matched nested case-control study is an efficient observational design embedded within a defined cohort. When a participant develops the outcome of interest (a case), a small number of controls are sampled from those still at risk at that moment and matched to the case on key variables such as age, sex, or calendar time. This design preserves the temporal structure of the underlying cohort while sharply reducing the cost of exposure measurement.	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.