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Table 1 Severity parameters for AAA rupture

From: Analysis and computer program for rupture-risk prediction of abdominal aortic aneurysms

BF i Definition Reported ranges of biomechanical factors (BF i ) Weighing coefficients w i References for BF i -ranges
   Low risk Middle risk High risk Danger zone   
i = 1: Diameter ratio 1.5~1.9 2.0~2.4 2.5~3.2 ≥3.3 0.20 Cappeller [6]
i = 2: Expansion rate (per year) 0.01~0.04 0.05~0.09 0.10~0.17 ≥0.18 0.25 Limet [2]
i = 3: Stress ratio 1.5~2.0 2.1~3.0 3.1~4.3 ≥4.4 0.15 Fillinger [4]
i = 4: Diastolic pressure ratio 0.83~0.9 0.91~1.0 1.1~1.16 ≥1.17 0.12 Cronenwett [20]
i = 5: Asymmetry index 1~0.9 0.7~0.8 0.5~0.6 ≤0.4 0.07 Vorp [36]
i = 6: ILT-AAA ratio 0.1~0.24 0.25~0.44 0.45~0.61 ≥0.62 0.07 Cappeller [6]
i = 7: Stiffness decrease (per year) 0.01~0.03 0.04~0.06 0.07~0.09 ≥0.1 0.07 Wilson [23]
i = 8: Saccular index ≥0.71 0.66~0.70 0.61~0.65 ≤0.6 0.07 Ouriel [41]
Assigned BF i threshold values 0.1 0.3 0.7 1.0