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Female sex and acute severity increase odds of post-COVID outcomes in hospitalized patientsSpecific risk factors increase the likelihood of long-term COVID effects

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Key Takeaway
Note that female sex, severe disease, ICU admission, and lack of vaccination increase odds of post-COVID outcomes.

This meta-analysis synthesized observational data to identify risk factors associated with post-COVID outcomes in patients previously hospitalized for COVID-19. The analysis focused on several variables including sex, disease severity, ICU admission, vaccination status, and hypertension.

Several factors were significantly associated with higher odds of post-COVID outcomes. Female sex was associated with an OR 1.94 (95% CI 1.60 to 2.35). Greater acute disease severity or advanced respiratory support showed an OR 2.55 (95% CI 1.77 to 3.68). ICU admission (OR 1.88, 95% CI 1.24 to 2.83), no or incomplete vaccination (OR 1.90, 95% CI 1.33 to 2.72), and hypertension (OR 1.60, 95% CI 1.16 to 2.20) also correlated with increased odds of post-COVID outcomes.

The authors note that the evidence is limited by heterogeneous outcome definitions and a small number of studies available for several risk factors. Because these results are based on observational data, they indicate associations rather than direct causation. These findings may support a risk-based approach to follow-up care after hospital discharge.

Recovering from COVID-19 is not a uniform experience. For many people, the illness lingers long after they leave the hospital. New research looks at why some patients face more lasting challenges than others. The study looked at people who were hospitalized for COVID-19 to see which factors predicted poor outcomes at least four weeks after their initial infection.

Several specific factors showed a clear link to higher odds of these lingering issues. These included being female, having high blood pressure (hypertension), and not having a complete vaccination. Additionally, patients who experienced severe illness that required advanced respiratory support or an ICU stay were more likely to face lasting problems.

While these findings help doctors identify who might need extra follow-up care after they leave the hospital, it is important to note that these results are based on observational data. This means the study shows a link between these factors and long-term symptoms, but it does not prove one causes the other. The evidence is also limited by some differences in how researchers defined outcomes across different studies.

What this means for you:
Factors like being female, having hypertension, or needing ICU care increase the risk of lingering COVID symptoms.

Common questions

Who is at higher risk for long-term symptoms?

People who were hospitalized for COVID-19 and experienced certain factors had higher odds of lingering issues. These included being female, having high blood pressure (hypertension), not having a complete vaccination, or requiring advanced respiratory support or an ICU stay during their illness.

How much did these risk factors increase the likelihood of symptoms?

The study found specific odds for several factors. For example, being female showed higher odds (OR 1.94), while needing advanced respiratory support showed even higher odds (OR 2.55). ICU admission and incomplete vaccination also showed increased odds of post-COVID outcomes.

Is this study's evidence certain?

The results show a link between these factors and long-term symptoms, but the evidence is limited by some inconsistencies in how different studies defined their outcomes. Because it was based on observational data, it shows an association rather than direct cause.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedAug 2026
View Original Abstract ↓
BackgroundPost-COVID-19 condition is a major source of long-term morbidity after SARS-CoV-2 infection. Patients hospitalized for COVID-19 may be at particularly high risk because hospitalization often reflects greater acute disease severity and comorbidity burden. However, evidence on risk factors in previously hospitalized populations remains inconsistent due to differences in outcome definitions, follow-up periods, and analytical approaches. This systematic review and meta-analysis aimed to identify risk factors associated with post-COVID outcomes among patients previously hospitalized for COVID-19.MethodsA systematic review and meta-analysis was conducted following PRISMA 2020 principles. PubMed/MEDLINE, Scopus, Web of Science Core Collection, and the WHO COVID-19 Global Literature Database were searched for studies published between 1 January 2020 and 24 February 2026. Eligible studies included hospitalized patients with confirmed or probable COVID-19, assessed post-acute outcomes at least 4 weeks after acute infection, hospitalization, recovery, or discharge, and evaluated at least one candidate risk factor. Adjusted effect estimates were prioritized, and random-effects meta-analyses were performed when at least two comparable estimates were available.ResultsEleven studies were included in the qualitative synthesis, and seven contributed to quantitative meta-analysis. Five risk-factor groups were pooled: female sex, acute disease severity or respiratory support, intensive care unit (ICU) admission, vaccination status, and hypertension. Female sex was associated with higher odds of post-COVID outcomes (OR 1.94, 95% CI 1.60–2.35; I2 = 6.9%). The strongest association was observed for greater acute disease severity or advanced respiratory support (OR 2.55, 95% CI 1.77–3.68; I2 = 13.0%). ICU admission (OR 1.88, 95% CI 1.24–2.83), no or incomplete vaccination (OR 1.90, 95% CI 1.33–2.72), and hypertension (OR 1.60, 95% CI 1.16–2.20) were also associated with increased odds. Additional predictors, including obesity, age, smoking, dysgeusia, symptom burden, and neurological or psychiatric comorbidity, were summarized narratively.ConclusionAmong previously hospitalized COVID-19 patients, the most consistent risk factors for post-COVID outcomes were female sex, greater acute disease severity or respiratory support, ICU admission, no or incomplete vaccination, and hypertension. These findings support risk-based post-discharge follow-up, although the evidence remains limited by heterogeneous outcome definitions and the small number of studies available for several risk factors.
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