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Research Methods & Reporting

The imprinting effect of covid-19 vaccines: an expected selection bias in observational studies

BMJ 2023; 381 doi: (Published 07 June 2023) Cite this as: BMJ 2023;381:e074404

Linked Fast Facts

Selection bias due to conditioning on a collider

Article usage

Article metrics provide readers and authors with an indication of how often a specific article has been accessed month by month. It counts three formats - abstract/extract, full text and pdf. The page is updated each day.

Usage statistics: June 2023 to February 2024

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Jun 2023437791581
Jul 202322335210
Aug 2023181976154
Sep 2023142179162
Oct 20234174780
Nov 20230151476
Dec 20230123249
Jan 20241122362
Feb 2024092841