Fig. 2From: Changes in serum levels of apelin and nitric oxide in hospitalized patients with COVID-19: association with hypertension, diabetes, obesity, and severity of diseaseNitrite level in the studied groups. Panel A indicates overall nitrite level in COV patients compared to non-COV individuals analyzed by Mann–Whitney U test. Panel B indicates nitrite level based on underlying diseases subgroups analyzed by Kruskal–Wallis test followed by Mann–Whitney U test. @ P < 0.05 vs. non-COV, *P < 0.05, **P < 0.01, vs. CTL. #P < 0.05 vs. DM group, CTL control (healthy subjects), HTN hypertension, DM diabetes mellitus, OB obese. n = 15–20 in each groupBack to article page