marginally significantP = 0.082
First, we evaluate ‘confounding effect.’ Among the unmeasured variable, history of hypertension (HTN) and number of endovascular managements were marginally significant (HR, 0.194; 95% CI, 0.031–1.239; P = 0.082 and HR, 0.600; 95% CI, 0.420–0.858; P = 0.057).