Linganisha mbinu

	Utafiti wa Kesi-Udhibiti Uliojengwa kwa Vitendo	Pragmatic randomized clinical trial
Nyanja	Epidemiolojia	Epidemiolojia
Familia	Process / pipeline	Process / pipeline
Mwaka wa asili	1977 (nested case-control); pragmatic variant emerged in real-world evidence research from 1990s onwards	1967
Mwanzilishi	Duncan Thomas (nested case-control); pragmatic design concept from Schwartz & Lellouch (1967)	Daniel Schwartz & Joseph Lellouch
Aina	Observational epidemiological study design	Interventional study design
Chanzo asilia	Thomas, D. C. (1977). Addendum to: Methods of cohort analysis: Appraisal by application to asbestos mining. Journal of the Royal Statistical Society, Series A, 140(4), 469–491.	Schwartz, D., & Lellouch, J. (1967). Explanatory and pragmatic attitudes in therapeutical trials. Journal of Chronic Diseases, 20(8), 637–648.
Majina mbadala	real-world nested case-control, pragmatic NCC, nested case-control in routine data, real-world evidence nested case-control	pragmatic RCT, effectiveness trial, real-world RCT, practical clinical trial
Zinazohusiana	5	6
Muhtasari	A pragmatic nested case-control study embeds a case-control analysis within a pre-existing real-world cohort — typically drawn from electronic health records, administrative claims, or disease registries — to examine associations between exposures and outcomes under routine clinical conditions. Controls are sampled from the risk set (those still at risk at the time each case occurs), preserving temporal sequence while dramatically reducing data-collection costs compared with a full cohort analysis.	A pragmatic randomized clinical trial (pragmatic RCT) is an interventional study that tests whether a treatment works under routine clinical conditions, as opposed to the tightly controlled setting of an explanatory trial. It prioritizes broad eligibility, flexible delivery, and patient-relevant outcomes to answer the question 'Does this treatment work in everyday practice?' rather than 'Can this treatment work under ideal circumstances?' The distinction between pragmatic and explanatory trials was formally articulated by Schwartz and Lellouch in 1967 and operationalized by the PRECIS tool in 2009.