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Data extraction

TH Thomas Harder
OW Ole Wichmann
SK Stefanie J. Klug
MS Marianne A. B. van der Sande
MW Miriam Wiese-Posselt
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From the eligible studies, two independent reviewers (TH, MWP) used standardized forms to extract study characteristics and assess methodological quality. In case of disagreement, a final decision was made by consensus. The corresponding authors or principal investigators of three studies were contacted for additional data and information [24–26]. The following data were extracted: study location, study design, study period, inclusion criteria, exclusion criteria, age at enrolment, duration of follow-up, vaccine used, comparator, study sponsorship, conflict of interests, number (proportion) of vaccinated participants with outcome, number (proportion) of control participants with outcome, unadjusted estimates, adjusted estimates, confounders.

Copyright and License information: The Author(s). ©2018
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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