| Value | Category | Cases | |
|---|---|---|---|
| 1 | Water seal | 19104 |
93.1%
|
| 2 | Pour flush | 1418 |
6.9%
|
| 3 | Pit | 0 |
0%
|
| 9 | Other (specify) | 0 |
0%
|
| Sysmiss | 18 |