Among COVID-19 patients, PON-1 activity was inversely associated with BMI and significantly lower in those with a diagnosis of diabetes (geometric mean: 1299 μU/mL 95% CI 1044; 1615 vs. 1639 μU/mL 95% CI 1485; 1810) [57] or hypertension (geometric mean: 1419 μU/ML 95% CI 1238; 1626 vs. 1709 μU/ML 95% CI 1516; 1928) [58]. This evidence concerns the gene PON1 and COVID-19.