FMO5 and aneurysm: We observed statistically significant positive correlations between these parameters, although correlation between aneurysm size and NADPH-stimulated O2•− production (as a measure of NADPH oxidase activity) was stronger than with basal superoxide production (R = 0.5; p < 0.01 vs. R = 0.3; p < 0.05 using the Spearman correlation test).