Women were at increased risk compared to men (aHR 1.52, 95% CI 1.48–1.56). Older age above 30 years was associated with a higher risk of reporting long COVID symptoms in the univariate analysis; however, after adjusting for baseline covariates, older age was associated with a lower risk, with those aged 30–39 years having a 6% lower risk (0.94, 0.90–0.97) and those aged ≥70 years having a 25% lower risk (0.75, 0.70–0.81) compared to those aged 18–30 years.
The comorbidities with the largest associations were COPD (aHR 1.55, 95% CI 1.47–1.64), benign prostatic hyperplasia (1.39, 1.28–1.52), fibromyalgia (1.37, 1.28–1.47), anxiety (1.35, 1.31–1.39), erectile dysfunction (1.33, 1.26–1.41), depression (1.31, 1.27–1.34), migraine (1.26, 1.22–1.30), multiple sclerosis (1.26, 1.03–1.53), celiac disease (1.25, 1.09–1.43) and learning disability (1.24, 1.11–1.40)
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