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Combien de personnes ont développé des symptômes ou contracté la Covid-19 au Québec ? Une étude exploratoire

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  • David Boisclair
  • Roxane Borgès Da Silva
  • Nathalie de Marcellis-Warin
  • Pierre-Carl Michaud
  • Ingrid Peignier

Abstract

This update integrates the data from the second week of collection, which took place from January 20 to 25, 2022, with a sample of 3001 respondents representative of the Quebec population and compares them to the first week of collection. → Update 2nd week of collection (January 20-25, 2022) We estimate the incidence of COVID-19, which is the number of adult persons who tested positive for COVID-19, either rapid or PCR, or self-diagnosed as having COVID-19 on the basis of symptoms, over a 7-day period ending January 13-18, 2022. We present a direct sampling estimate on the adult population as well as an indirect sampling estimate based on the network scale-up method. Our results suggest that during this period 261,863 people tested positive, which is similar to the network scale-up estimates (ranging from 231,967 to 251,706 depending on the method). On a daily basis, these figures indicate that there were an average of 33,000 to 38,000 positive tests per day in Quebec during the period. In addition, 146,567 people report a positive self-diagnosis, which when added to those with a positive test result gives an estimate of 407,430 probable cases of COVID-19 in the adult population (58,144 on average per day). In comparison, INSPQ data report 48,815 positive cases based on PCR tests in Quebec during the same seven-day period (6,973 on average per day). Regardless of the method and estimator used (excluding self-diagnosis), we obtain an incidence that is about five times higher than the official figure. The survey will be repeated over 4 consecutive weeks in order to follow the evolution. To quote this document Boisclair, D., Borgès Da Silva, R., Boucher, V., De Marcellis-Warin, N., Michaud, P-C et Peignier, I. (2022). Combien de personnes ont développé des symptômes ou contracté la Covid-19 au Québec? Une étude exploratoire (2022s-03). https://doi.org/10.54932/KWYT2364 → Mise à jour 2e semaine de collecte (20 au 25 janvier 2022) Cette mise à jour intègre les données de la 2e semaine de collecte ayant eu lieu du 20 au 25 janvier 2022 auprès d’un échantillon de 3001 répondants représentatif de la population du Québec et les compare à la première semaine de collecte. Nous estimons l'incidence de la COVID-19, soit le nombre de personnes adultes ayant reçu un résultat positif à un test, rapide ou PCR, ou s'étant auto-diagnostiquées comme ayant eu la COVID-19 sur la base des symptômes, sur une période de sept jours se terminant entre le 13 et le 18 janvier 2022. Nous présentons une estimation par échantillonnage direct sur la population adulte ainsi qu'une estimation par échantillonnage indirect basée sur la méthode de l'amplificateur par réseau (network scale up method). Nos résultats suggèrent que durant cette période 261 863 personnes ont reçu un résultat positif à un test, ce qui est semblable aux estimations par la méthode de l'amplificateur par réseau (variant de 231 967 à 251 706 selon la méthode). Sur une base journalière, ces chiffres indiquent qu'il y avait en moyenne 33 000 à 38 000 tests positifs par jour au Québec durant la période. De plus, 146 567 personnes rapportent un auto-diagnostic positif, ce qui une fois ajouté aux personnes ayant reçu un résultat de test positif donne une estimation de 407 430 cas probables de COVID-19 au sein de la population adulte (58 144 en moyenne par jour). Comparativement, les données de l'INSPQ rapportent 48 815 cas positifs sur la base de tests PCR au Québec durant cette même période de sept jours (6 973 en moyenne par jour). Peu importe la méthode et l'estimateur utilisé (en excluant les auto-diagnostics), nous obtenons une incidence qui est environ cinq fois plus élevée que le chiffre officiel. L'enquête sera répétée sur 4 semaines consécutives dans un objectif de suivre l'évolution. Pour citer ce document Boisclair, D., Borgès Da Silva, R., Boucher, V., De Marcellis-Warin, N., Michaud, P-C et Peignier, I. (2022). Combien de personnes ont développé des symptômes ou contracté la Covid-19 au Québec? Une étude exploratoire (2022s-03). https://doi.org/10.54932/KWYT2364

Suggested Citation

  • David Boisclair & Roxane Borgès Da Silva & Nathalie de Marcellis-Warin & Pierre-Carl Michaud & Ingrid Peignier, 2022. "Combien de personnes ont développé des symptômes ou contracté la Covid-19 au Québec ? Une étude exploratoire," CIRANO Working Papers 2022s-05, CIRANO.
  • Handle: RePEc:cir:cirwor:2022s-05
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    More about this item

    Keywords

    COVID-19; Quebec; Network Scale Up Method (NSUM); Incidence; COVID-19; Québec; Amplificateur par réseau; Incidence;
    All these keywords.

    JEL classification:

    • C83 - Mathematical and Quantitative Methods - - Data Collection and Data Estimation Methodology; Computer Programs - - - Survey Methods; Sampling Methods
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health

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