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. Author manuscript; available in PMC: 2023 Nov 28.
Published in final edited form as: Ann Surg. 2021 Jul 1;274(1):179–185. doi: 10.1097/SLA.0000000000003446

Table 3:

CART informed Cox-regression model examining predictors and interaction terms associated with reintervention.

Predictors HR 95% CI
Emergent surgery for ruptured aneurysm 2.686 0.869-3.268
Aneurysm ≥6.0 centimeters 1.814 1.438-2.291
Prior aortic surgery 1.694 0.959-2.993
Iliac artery aneurysm 1.205 0.940-1.545
Procedure time, per minute 1.003 1.002-1.004
Interaction terms
Prior aortic surgery and emergent surgery 2.966 1.481-5.942
Prior aortic surgery and aneurysm ≥ 6.0 centimeters 1.139 0.710-1.828
Prior aortic surgery and iliac artery aneurysm 1.133 0.699-1.837
Iliac artery aneurysm and emergent surgery 1.012 0.562-1.822
Procedure time and emergent surgery 1.004 1.001-1.007
Procedure time and iliac artery aneurysm 1.000 0.998-1.001
Procedure time and aneurysm ≥6.0 centimeters 0.998 0.997-0.999
Procedure time and prior aortic surgery 0.998 0.996-1.001
Aneurysm ≥6.0 centimeters and emergent surgery 0.411 0.232-0.732

Legend: CART, classification and regression tree, HR, hazard ratio; CI, confidence interval.