National trends in surgical treatment and clinical outcomes among patients with aneurysmal subarachnoid hemorrhage in the Republic of Korea.

A recent study using National Inpatient Sample data in the United States reported that the mortality rate from 2006 to 2018 was 10–15%; however, it did not show a decreasing trend over the years [ 6 ].

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A United States study using the Nationwide Inpatient Sample Database from 2006 to 2018 showed a yearly mortality rate of 13.1–13.7% and did not demonstrate a significant trend in mortality reduction [ 6 ].

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