30 day mortality was 35.4 % ( 112/316 ) in the endovascular strategy group and 37.4 % ( 111/297 ) in the open repair group : odds ratio 0.92 ( 95 % confidence interval 0.66 to 1.28 ; P = 0.62 ) ; odds ratio after adjustment for age , sex , and Hardman index 0.94 ( 0.67 to 1.33 ) .