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Cox regression of the cumulative need for surgery based on high-density lipoprotein HDL-mediated macrophage cholesterol efflux (MCE) tertiles in all AAA patients (a) and in small/medium size AAA patients (b). The observation time to surgery is represented in years. The cumulative need for later repair represents the need for surgery over the follow-up. The lowest MCE tertile is shown in blue, the mid tertile is shown in green and the highest tertile is shown in red.
