Synopsis with statistical analysis plan for "Prevalence, risk factors, and clinical course of iliac aneurysms – a sub study of the population based DANCAVAS trials: Risk factor divergence in iliac artery aneurysms with vs without concomitant aorta aneurysms

In the attached document is the pre-registered Statistical Analysis Plan for "Prevalence, risk factors, and clinical course of iliac aneurysms – a sub study of the population based DANCAVAS trials: Risk factor divergence in iliac artery aneurysms with vs without concomitant aorta aneurysms ". The study aims to 1) Describe the prevalence and risk factors for IAA, overall and stratified by coexisting AAA 2) Describe their growth rates and risk factors for progression 3) Describe IAA’s clinical course to repair, rupture, major adverse cardiac events (MACE), major adverse limb events (MALE), and overall mortality