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. 2021 May 10;5(1):e001049. doi: 10.1136/bmjpo-2021-001049

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Health and administrative education data linkages. Four data sources are used to create our e-cohort: the Welsh COVID-19 e-cohort, SWAC, PLASC and COVID-19 antigen testing data. We linked SWAC and PLASC to the Welsh COVID-19 e-cohort. We also linked staff and pupils via educational settings using a SALF. Furthermore, we linked staff and pupils to their household members using the Welsh COVID-19 e-cohort. Missing variables of staff and pupils (in the Welsh COVID-19 e-cohort) before being confirmed eligible are reported in online supplemental table S3. PLASC, Pupil Level Annual School Census; SALF, School Anonymised Linking Field; SWAC, School Workforce Annual Census.