| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes, under ground drain | 2155 |
13.4%
|
| 2 | yes, to covered drain | 303 |
1.9%
|
| 3 | yes, to open drain | 5167 |
32.1%
|
| 4 | no, no system | 8463 |
52.6%
|
| Sysmiss | 38 |