| VTE type | First year | Annual rate after first year |
| First episode of unprovoked VTE | 10 percent | 5 percent |
| Second episode of unprovoked VTE | 15 percent | 7.5 percent |
| First VTE provoked by surgery | 1 percent | 0.5 percent |
| First VTE provoked by non-surgical factor | 5 percent | 2.5 percent |
