| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes, under ground drain | 2147 |
13.3%
|
| 2 | yes, to covered drain | 307 |
1.9%
|
| 3 | yes, to open drain | 4942 |
30.5%
|
| 4 | no, no system | 8786 |
54.3%
|
| Sysmiss | 43 |