LUS grade | 1–10 to 11–20 min (%) | 11–20 min to 1 hour (%) | 1 to 2 hours (%) | 2 to 4 hours (%) | 4 to 24 hours (%) |
Type 3/3 to 3/2 | 26 | 29 | 9 | 6 | 0 |
Type 3/2 to 2/2 | 43 | 42 | 20 | 10 | 0 |
Type 3/3 to 2/2 | 11 | 16 | 4 | 3 | 0 |
Type 2/2 to 2/1 | 0 | 2 | 0 | 0 | 0 |
Type 2/2 to 1/1 | 0 | 0 | 0 | 0 | 0 |
Total | 18 | 27 | 9 | 6 | 0 |