Utilizing this cutoff value, AAA patients (n = 75) were divided into 2 groups, (1) Low C2 group (n = 24) with C2 concentration < 0.202 ug/mL and (2) High C2 group (n = 51) with C2 concentration > 0.202 ug/mL. Here, C2 is linked to triple-A syndrome.