Population

Data were collected from two groups of patients:

• Adults (≥16 years of age) that underwent surgery for the first time repair of an AAA; both elective and emergency procedures were included, as well as endovascular repair.
• Adults who were diagnosed with an AAA but did not undergo surgery and subsequently died in hospital during the same hospital episode.

Patients undergoing a repeat repair of an AAA or surgery that was for complications arising from the initial repair of the AAA were excluded.