Over the ten years we studied, we found 52864 patients. In 2004, clipping was used in 25% of patients(n=1290), endovascular therapy in 15%(n=771); by 2014, clipping had fallen to 13%(n=630), while 29% underwent endovascular therapy(n=1374). In the group as a whole, in-hospital mortality declined from 26% in 2004 to 19% in 2014 (p<0.0001), and poor outcome declined from 63% in 2004 to 58% in 2014 (p<0.0001).
The average age, sex ratio and proportion of White ethnicity was the same in the endovascular and clipping groups. The average length of stay did not significantly change over the years in either group. Average total charges showed a rise over the years (p<0.001). Charges (inflation-adjusted, 2014 dollars) were similar in the beginning (endovascular $196355 vs clipping $191855 in 2004), showed some divergence by 2014 (endovascular $368,326 vs clipping $394,036), but there was no significant difference between the groups. No significant mortality difference was seen between the endovascular and clipping populations (2004: 16% vs 10%, p=0.058; 2014: 10.7% vs 10.1%, p=0.707).