longitudinal study

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longitudinal study2016-12-13T06:02:01+00:00

longitudinal study 


An epidemiological study that follows a large population forward over a long period of time, evaluating the effects of one or more variables on a process

Longitudinal studies are the converse of horizontal studies

Types of longitudinal studies 

• Longitudinal cohort study Individuals are followed

• Longitudinal cross-sectional study Classes–e.g., age classes– are studied

Examples Cohort studies, case-control studies, Framingham Study in Massachusetts, US; Port Pirie study, an ongoing analysis of the long-term effects of blood lead levels on IQ. 

Synonyms Diachronic study, longitudinal observational study 

References http://www.appliedclinicaltrialsonline.com/appliedclinicaltrials/article/articleDetail.jsp?id=700052&sk=&date=1&pageID=22
NEJM 1992; 327:1285oa    

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