Time-dependent study entries and exposures in cohort studies can easily be sources of different and avoidable types of bias

Wolkewitz, Martin; Allignol, Arthur; Harbarth, Stéphan Juergen; de Angelis, Giulia; Schumacher, Martin; Beyersmann, Jan

doi:10.1016/j.jclinepi.2012.04.008

Scientific article

English

Time-dependent study entries and exposures in cohort studies can easily be sources of different and avoidable types of bias

ContributorsWolkewitz, Martin; Allignol, Arthur; Harbarth, Stéphan Juergen

; de Angelis, Giulia; Schumacher, Martin; Beyersmann, Jan

Published inJournal of clinical epidemiology, vol. 65, no. 11, p. 1171-1180

Publication date2012

Abstract

To display and discuss the reasons and consequences of length and time-dependent bias. They might occur in presence of a time-dependent study entry or a time-dependent exposure which might change from unexposed to exposed.

Keywords

Abortion, Spontaneous/epidemiology
Alzheimer Disease/mortality
Cohort Studies
Coronary Disease/epidemiology
Cross Infection/epidemiology
Data Interpretation, Statistical
Diabetes Mellitus/epidemiology
Female
Heart Transplantation/mortality
Humans
Length of Stay/statistics & numerical data
Liver Cirrhosis/mortality
Pregnancy
Proportional Hazards Models
Selection Bias
Survival Analysis
Time Factors

Affiliation entities

Faculté de médecine / Section de médecine clinique / Département de médecine

Research groups

Résistance aux antibiotiques (866)

Citation (ISO format)

WOLKEWITZ, Martin et al. Time-dependent study entries and exposures in cohort studies can easily be sources of different and avoidable types of bias. In: Journal of clinical epidemiology, 2012, vol. 65, n° 11, p. 1171–1180. doi: 10.1016/j.jclinepi.2012.04.008

Article (Published version)

Identifiers

PID : unige:32544
DOI : 10.1016/j.jclinepi.2012.04.008
PMID : 23017635

Journal ISSN0895-4356

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Time-dependent study entries and exposures in cohort studies can easily be sources of different and avoidable types of bias

To display and discuss the reasons and consequences of length and time-dependent bias. They might occur in presence of a time-dependent study entry or a time-dependent exposure which might change from unexposed to exposed.

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