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Archambault PM, Rosychuk RJ, Audet M, Bola R, Vatanpour S, Brooks SC, Daoust R, Clark G, Grant L, Vaillancourt S, Welsford M, Morrison L, Hohl C, Canadian COVID-19 Emergency Department Rapid Response Network (CCEDRRN) investigators , Network of Canadian Emergency Researchers , Canadian Critical Care Trials Group
Accuracy of Self-Reported COVID-19 Vaccination Status Compared With a Public Health Vaccination Registry in Québec: Observational Diagnostic Study
Accuracy of Self-Reported COVID-19 Vaccination Status Compared to a Public Health Vaccination Registry: Observational Diagnostic Study in Québec
Patrick M Archambault;
Rhonda J Rosychuk;
Martyne Audet;
Rajan Bola;
Shabnam Vatanpour;
Steven C Brooks;
Raoul Daoust;
Gregory Clark;
Lars Grant;
Samuel Vaillancourt;
Michelle Welsford;
Laurie Morrison;
Corinne Hohl;
Canadian COVID-19 Emergency Department Rapid Response Network (CCEDRRN) investigators;
Network of Canadian Emergency Researchers;
Canadian Critical Care Trials Group
ABSTRACT
Background:
Accuracy of self-reported vaccination status is important to guide real-world vaccine effectiveness studies in jurisdictions where access to electronic vaccine registries is restricted.
Objective:
Determine the accuracy of self-reported vaccination status.
Methods:
This study was a diagnostic accuracy study completed by the Canadian COVID-19 Emergency Department Rapid Response Network (CCEDRRN). We compared the self-reported vaccination status of 1,361 patients diagnosed with COVID-19 who presented to one of four emergency departments (EDs) with their vaccination status in the electronic Québec Vaccination Registry. Our primary outcome was the accuracy of self-reported vaccination status (index test) ascertained during phone follow-up compared to the Québec Vaccination Registry (reference standard). Accuracy was calculated by dividing all correctly self-reported vaccinated and unvaccinated participants by the sum of all correctly and incorrectly self-reported vaccinated and unvaccinated participants. We also report inter-rater agreement with the reference standard as measured by unweighted Cohen’s Kappa for self-reported vaccination status at phone follow-up and at the time of their index ED visit, number of vaccine doses, and brand.
Results:
The accuracy of the self-reported vaccination status was 96% (95% CI: 95-97). Cohen’s Kappa for self-reported vaccination status at phone follow-up was 0.91 (0.89-0.93) and 0.85 (0.77, 0.92) at the time of their index ED visit. Cohen’s Kappa was: 0.89 (0.87-0.91) for the number of doses, 0.80 (0.75-0.84) for the brand of Dose 1, 0.76 (0.70-0.83) for Dose 2, and 0.59 (0.34, 0.83) for Dose 3.
Conclusions:
We report high accuracy of self-reported vaccination status for adult ED patients. The inter-rater agreement between self-reported number of doses and vaccination status was strong. Although the agreement for self-reported brand was strong when one dose was reported, the agreement decreased with repeat doses. Clinical Trial: Clinicaltrials.gov NCT04702945
Citation
Please cite as:
Archambault PM, Rosychuk RJ, Audet M, Bola R, Vatanpour S, Brooks SC, Daoust R, Clark G, Grant L, Vaillancourt S, Welsford M, Morrison L, Hohl C, Canadian COVID-19 Emergency Department Rapid Response Network (CCEDRRN) investigators , Network of Canadian Emergency Researchers , Canadian Critical Care Trials Group
Accuracy of Self-Reported COVID-19 Vaccination Status Compared With a Public Health Vaccination Registry in Québec: Observational Diagnostic Study