| Value | Category | Cases | |
|---|---|---|---|
| 1 | flat | 1 |
1.4%
|
| 2 | gentle slope | 45 |
60.8%
|
| 3 | steep slope | 17 |
23%
|
| 4 | hilly | 11 |
14.9%
|
| Sysmiss | 1 |