C2 and triple-A syndrome: Conversely, compared to non-AAA patients, patients with AAA had a significantly lower median [IQR] levels of plasma factors C2 (0.26 ug/mL [0.19–0.41] vs. 0.33 ug/mL [0.28–0.42], p = 0.027), C3 (83.3 ug/mL [40.8–145] vs. 136 ug/mL [53–329], p = 0.014), and C4b (9.07 ug/mL [6.53–12.3] vs. 13.7 ug/mL [7.97–20.2], p = 0.006).