Figure 1. Survival among hospitalized patients with COVID-19 who had IgG antibodies to SARS-CoV-2 and those who did not. Positive: patients who had IgG antibodies to SARS-CoV-2. Negative: patients who did not have IgG antibodies to SARS-CoV-2. Adjust hazard ratio: adjusted for age, sex, and severity of COVID-19 at admission.