PON1 and psoriasis: The mean serum paraoxonase 1 concentration in patients with psoriasis was 0.404 ± 0.068 ug/mL before treatment and after 0.430 ± 0.069 ug/mL, and this did not differ significantly, compared to the controls: 0.228 ± 0.047 ug/mL (p > 0.05) (Figure 3a).