Numbers of patients with positive transthoracic echocardiography according to the number of risk factors present*
| Number of risk factors present | Number of patients in each group | Proportion with positive TTE |
|---|---|---|
| *Vasculitic/embolic phenomena, the presence of central venous access, a recent history of injected drug use, presence of a prosthetic valve, and positive blood cultures. | ||
| 0 | 239 (48%) | 0 |
| 1 | 192 (38%) | 6 (14%) |
| 2 | 49 (10%) | 17 (40%) |
| 3–5 | 20 (4%) | 20 (46%) |