Case-control vaccine effectiveness studies: Data collection, analysis and reporting results.

Abstract:

:The case-control methodology is frequently used to evaluate vaccine effectiveness post-licensure. The results of such studies provide important insight into the level of protection afforded by vaccines in a 'real world' context, and are commonly used to guide vaccine policy decisions. However, the potential for bias and confounding are important limitations to this method, and the results of a poorly conducted or incorrectly interpreted case-control study can mislead policies. In 2012, a group of experts met to review recent experience with case-control studies evaluating vaccine effectiveness; we summarize the recommendations of that group regarding best practices for data collection, analysis, and presentation of the results of case-control vaccine effectiveness studies. Vaccination status is the primary exposure of interest, but can be challenging to assess accurately and with minimal bias. Investigators should understand factors associated with vaccination as well as the availability of documented vaccination status in the study context; case-control studies may not be a valid method for evaluating vaccine effectiveness in settings where many children lack a documented immunization history. To avoid bias, it is essential to use the same methods and effort gathering vaccination data from cases and controls. Variables that may confound the association between illness and vaccination are also important to capture as completely as possible, and where relevant, adjust for in the analysis according to the analytic plan. In presenting results from case-control vaccine effectiveness studies, investigators should describe enrollment among eligible cases and controls as well as the proportion with no documented vaccine history. Emphasis should be placed on confidence intervals, rather than point estimates, of vaccine effectiveness. Case-control studies are a useful approach for evaluating vaccine effectiveness; however careful attention must be paid to the collection, analysis and presentation of the data in order to best inform evidence-based vaccine policies.

journal_name

Vaccine

journal_title

Vaccine

authors

Verani JR,Baqui AH,Broome CV,Cherian T,Cohen C,Farrar JL,Feikin DR,Groome MJ,Hajjeh RA,Johnson HL,Madhi SA,Mulholland K,O'Brien KL,Parashar UD,Patel MM,Rodrigues LC,Santosham M,Scott JA,Smith PG,Sommerfelt H,Tate

doi

10.1016/j.vaccine.2017.04.035

subject

Has Abstract

pub_date

2017-06-05 00:00:00

pages

3303-3308

issue

25

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(17)30513-3

journal_volume

35

pub_type

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