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(A) Kaplan-Meier curves for the primary analysis showing the cumulative incidence of confirmed COVID-19 diagnoses or positive PCR test for SARS-CoV-2 after a therapeutic (red) vs. subtherapeutic (blue) lithium level in matched cohorts. The shaded areas around the curves [see pdf version of figure below] represent 95% confidence intervals. (B) Hazard ratios for the comparison between matched cohorts in the secondary and robustness analyses. *p<0.05, **p<0.01.
