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Volume 28, Number 3—March 2022

Effectiveness of 3 COVID-19 Vaccines in Preventing SARS-CoV-2 Infections, January–May 2021, Aragon, Spain

Alicia del Cura-BilbaoComments to Author , Héctor López-Mendoza, Armando Chaure-Pardos, Alberto Vergara-Ugarriza, and Joaquín Guimbao-Bescós
Author affiliations: Miguel Servet University Hospital, Zaragoza, Spain (A. del Cura-Bilbao); Aragon Department of Health, Zaragoza (A. del Cura-Bilbao, H. López-Mendoza, A. Chaure-Pardos, A. Vergara-Ugarriza, J. Guimbao-Bescós); University of Zaragoza CASSETEM Research Group, Zaragoza (H. López-Mendoza); Lozano Blesa University Hospital, Zaragoza (H. López-Mendoza, A. Chaure-Pardos); GRISSA Research Group, Zaragoza (A. Chaure-Pardos); Aragon Health Research Institute Foundation (IIS Aragon), Zaragoza (A. Chaure-Pardos)

Main Article

Table 2

Causes of loss to follow-up during the study period, Aragon, Spain, January–May 2021

Causes No. patients
Expiration of service* 3,328
Death 2,903
Change of residence to another region of Spain 2,020
Loss of entitlement† 250
Change of residence to another country 15
Duplicate user‡ 2
Unknown 3,039

*Aragon Health Service healthcare ended for administrative reasons. Most common were expiration of temporary service for persons who moved from another self-governing region of Spain for a specific period of time (maximum 6 months), subject to renewal; and for foreign citizens with no residence license who had not applied for renewal of Aragon Health Service–provided healthcare in 2 years. †Loss of entitlement to Aragon Health Service–provided healthcare when person begins working unless they renounce mutual insurance company–provided healthcare (applies to a few public workers in Spain whose healthcare provider is a mutual insurance company). ‡Health record of participant was duplicated in the Aragon Healthcare System Users Registry.

Main Article

Page created: December 14, 2021
Page updated: February 21, 2022
Page reviewed: February 21, 2022
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