Does Induction Time Have Any Bearing on Definition of Study Base?
作者:
Ulf Stromberg,
期刊:
Epidemiology
(OVID Available online 1994)
卷期:
Volume 5,
issue 3
页码: 356-359
ISSN:1044-3983
年代: 1994
出版商: OVID
关键词: epidemiologic methods;induction time;study base;study design;exposure categorization
数据来源: OVID
摘要:
A study population with either a low or high exposure prevalence usually results in a less efficient study, compared with a study on a population with an intermediate exposure prevalence. We discuss a strategy for improving efficiency when exposure is rare: one can include in the study base, for each individual, only follow-up corresponding to a potential exposure-associated increase in risk. This strategy is achieved by choosing so-calledpre inclusionandpreexclusionperiods, which, in turn, follow from relevant induction time assumptions.
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