showed a trendP =0.08
When changes in postprocedure complications (in‐hospital stroke, blood transfusion, AKI, vascular and respiratory complications) and center volume were accounted for in the model, the RR of 2016 compared with prior years in nonagenarians was attenuated but remained significant (aRR: 0.54; 95% CI, 0.42–0.70; P <0.001 compared with 2012; aRR: 0.80; 95% CI, 0.66–0.96; P =0.02 compared with 2015), whereas high‐volume centers showed a trend with lower 30‐day mortality in the full GEE model (aRR: 0.88; 95% CI, 0.73–1.02; P =0.08).