Observational studyViruses2021
COVEVOL: Natural Evolution at 6 Months of COVID-19.
Observational study in Viruses, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers, 4 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
11 citing papers in PubMed, 4 syntheses or guidelines pooled it, 19 citations in OpenAlex.
- Prevalence and long-term outcomes of brain fog and cognitive impairment in individuals with long COVID: A systematic review.Medicine · 2026Pooled it
- Symptom Trajectories and Clinical Subtypes in Post-COVID-19 Condition: Systematic Review and Clustering Analysis.JMIR public health and surveillance · 2025Pooled it
- Oral Manifestations in the Post COVID-19 Condition: A Systematic Review With Meta-Analysis.Reviews in medical virology · 2025Pooled it
- The bidirectional association between diabetes and long-COVID-19 - A systematic review.Diabetes research and clinical practice · 2023Pooled it
- Long COVID symptoms in the COVID unit of the emergency Department of Abderrahmen Mami Hospital in Tunisia: prevalence, main symptoms, and associated factors.The Pan African medical journal · 2025Article
- Review
- Psychological factors associated with Long COVID: a systematic review and meta-analysis.EClinicalMedicine · 2024Article
- Gastrointestinal and Hepatobiliary Symptoms and Disorders with Long (Chronic) COVID Infection.Gastroenterology clinics of North America · 2023Review
- Age, Sex and Previous Comorbidities as Risk Factors Not Associated with SARS-CoV-2 Infection for Long COVID-19: A Systematic Review and Meta-Analysis.Journal of clinical medicine · 2022Review
- Follow-Up of a Cohort of Patients with Post-Acute COVID-19 Syndrome in a Belgian Family Practice.Viruses · 2022Article
- Gastrointestinal manifestations of long COVID: A systematic review and meta-analysis.Therapeutic advances in gastroenterology · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
10 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Many studies have investigated post-COVID symptoms, but the predictors of symptom persistence remain unknown. The objective was to describe the natural course of the disease at 6 months and to identify possible factors favoring the resurgence or persistence of these symptoms. COVEVOL is a retrospective observational descriptive study of 74 patients. All patients with positive SARS-CoV-2 PCR from March 2020 were included. We compared a group with symptom persistence (PS group) with another group without symptom persistence (no-PS group). Fifty-three out of seventy-four patients (71.62%) described at least one persistent symptom at 6 months of SARS-CoV-2 infection. In the PS group, 56.6% were women and the average age was 54.7 years old [21-89.2] ± 16.9. The main symptoms were asthenia (56.6%,
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.