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Forest plot showing the multiplicative effect of potential influential factors on the number of long-COVID symptoms, as determined through multivariable Poisson regression. Factors in blue are negatively and those in red are positively associated with the number of symptoms. Abbreviation: BMI, body mass index; CI, confidence interval; COVID, coronavirus disease; COVID-19, coronavirus disease 2019; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
