Point: Immortal Time Bias-What Are the Determinants of Its Magnitude?
Am J Epidemiol
; 188(6): 1013-1015, 2019 06 01.
Article
em En
| MEDLINE
| ID: mdl-31155675
ABSTRACT
In cohort studies, "immortal time" bias refers to a portion of time during which events cannot occur for a particular group of participants. Typically, immortal time bias occurs when 1) Exposure can be initiated after follow-up of cohort members has begun; and 2) analytically, the preexposure experience is combined with that which takes place following exposure, rather than (correctly) as part of the experience of nonexposed individuals. Using the example of a cohort study of mortality in relation to receipt of cataract surgery, we sought to describe those study design and population characteristics that influence the magnitude of immortal time bias, so as to aid readers in gauging its impact on published research findings. These characteristics include the mean interval between cohort entry and when exposure criteria are met, the proportion of exposed study participants, and the length of study follow-up.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fatores de Tempo
/
Extração de Catarata
/
Viés
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Métodos Epidemiológicos
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Estudos de Coortes
Tipo de estudo:
Etiology_studies
/
Incidence_studies
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Observational_studies
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Risk_factors_studies
Limite:
Female
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Humans
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article