Prevalence and risk factors for post COVID condition 12 months after a test: evidence from a Portuguese region

Moniz, M.; Ruivinho, Carolina; Goes, Ana Rita; Soares, Patrícia; Leite, Andreia; LOCUS group

Publicação

Prevalence and risk factors for post COVID condition 12 months after a test: evidence from a Portuguese region

2025-09Documento de conferência

datacite.subject.fos	Ciências Médicas
datacite.subject.sdg	03:Saúde de Qualidade
dc.contributor.author	Moniz, M.
dc.contributor.author	Ruivinho, Carolina
dc.contributor.author	Goes, Ana Rita
dc.contributor.author	Soares, Patrícia
dc.contributor.author	Leite, Andreia
dc.contributor.author	LOCUS group
dc.date.accessioned	2026-03-03T17:17:44Z
dc.date.available	2026-03-03T17:17:44Z
dc.date.issued	2025-09
dc.description	Abstract publicado em: Gac Sanit. 2025;39(Suppl. 2):645. doi:10.1016/S0213-9111(25)00754-X
dc.description.abstract	Background/Objectives: PCC prevalence estimates vary widely. Additionally, its development is associated with multiple factors, from individual characteristics to the broader impacts of the pandemic. The aim of this study was to characterise the prevalence of symptoms 12 months after SARS-CoV-2 testing, comparing individuals with positive and negative test results, and to analyse the factors associated with the prevalence of Long COVID symptoms in individuals with a positive test in Lisbon and Tagus Valley. Methods: Cross-sectional study with individuals randomly selected from the National Epidemiological Surveillance System (SINAVE) of Portugal. We included individuals who underwent a SARS-CoV-2 test in August 2022, resided in the Lisbon and Tagus Valley region, were 18 years or older, and consented to participate. PCC was defined as the presence of #1 1 symptom 12 months after testing. Prevalence (Pr) was estimated for participants with positive and negative test results, with the respective 95% confidence interval (95%CI). To study the factors associated with Long COVID, we considered individuals with a positive test and applied a robust Poisson regression to estimate prevalence ratios (PR), with the respective 95%CI. Results: A total of 6,642 individuals were contacted, and the final sample included 699 individuals: 226 with a negative test and 473 with a positive test. PCC symptoms were slightly higher in individuals who tested positive (Pr: 41.65, 95%CI: 37.17; 46.24) than negative (Pr: 35.84, 95%CI: 29.59; 42.47), with confidence interval overlapping. Fatigue was the most prevalent symptom, particularly among positive individuals (Pr: 18.39, 95%CI: 15.00; 22.18 vs. 10.18, 95%CI: 6.56; 14.88). Factors associated with PCC symptoms were female (PR: 1.48 95%CI: 1.13; 1.96), age (PR: 1.01, 95%CI: 1.00; 1.02), number of symptoms during COVID-19 infection (PR: 1.06, 95%CI: 1.03; 1.09) and smoking (PR: 1.39, 95%CI: 1.08; 1.79). Conclusions/Recommendations: Most of the symptoms analysed did not show a higher prevalence in those who tested positive, highlighting the need to distinguish these symptoms from other postviral conditions and the broader effects of the pandemic. Factors associated with higher risk of PCC symptoms, highlight the importance of targeted follow-up and preventive strategies for these individuals. As our sample is predominantly composed of cases that did not require hospital care during the acute infection, the results also emphasise that symptoms can emerge in non-severe cases, representing a wider range of people at risk.	eng
dc.description.sponsorship	Pfizer
dc.identifier.uri	http://hdl.handle.net/10400.18/11062
dc.language.iso	eng
dc.peerreviewed	yes
dc.relation.hasversion	https://gacetasanitaria.org/en-400-prevalence-and-risk-articulo-S021391112500754X
dc.rights.uri	N/A
dc.subject	Risck Factors
dc.subject	COVID-19
dc.subject	Condição pós-COVID-19
dc.subject	Estados de Saúde e de Doença
dc.subject	Lisbon
dc.subject	Tagus Valley
dc.subject	Portugal
dc.title	Prevalence and risk factors for post COVID condition 12 months after a test: evidence from a Portuguese region	eng
dc.type	conference object
dspace.entity.type	Publication
oaire.citation.conferenceDate	2025-09
oaire.citation.conferencePlace	Las Palmas, Gran Canaria, Spain
oaire.citation.title	XX Congresso da Associação Portuguesa de Epidemiologia (APE)/XLIII Reunión anual de la Sociedad Española de Epidemiología (SEE), 2-5 september 2025
oaire.version	http://purl.org/coar/version/c_b1a7d7d4d402bcce