| Obstructed | Patent | Unknown | |
---|---|---|---|---|
Burial time | Short < 35 min (n = 106, 19%) | 15 (14%) | 43 (41%) | 48 (45%) |
Long ≥ 35 min (n = 374, 66%) | 46 (12%) | 106 (29%) | 222 (59%) | |
Unknown (n = 68, 12%) | 2 (3%) | 52 (77%) | 14 (20%) | |
Not assigned (n = 18, 3%) | 6 (33%) | 12 (67%) | 0 | |
Total (n = 566) | 69 (12%) | 213 (38%) | 284 (50%) |