| Value | Category | Cases | |
|---|---|---|---|
| 1 | flat | 143 |
74.5%
|
| 2 | gentle slope | 26 |
13.5%
|
| 3 | steep slope | 1 |
0.5%
|
| 4 | hilly | 22 |
11.5%
|
| Sysmiss | 51 |