Frequency of aortic valve infective endocarditis in patients with bicuspid and tricuspid aortic valves in the Italian cohort
| Aortic valve-only infective endocarditis | Other valve infective endocarditis | Total | |
| Bicuspid aortic valve | 38 (79.2%) | 10 (20.8%) | 48 |
| Tricuspid aortic valve | 115 (33.7%) | 226 (66.3%) | 371 |
Patients are classified as having IE of only the aortic valve, or having IE of any other valve including, or not including, the aortic valve. The observed risk ratio of having endocarditis of only the aortic valve was increased 7.5 times if the aortic valve was bicuspid (CI 3.6 to 15.5), p<0.0001.