| Value | Category | Cases | |
|---|---|---|---|
| 1 | flat | 135 |
52.5%
|
| 2 | gentle slope | 94 |
36.6%
|
| 3 | steep slope | 18 |
7%
|
| 4 | hilly | 10 |
3.9%
|
| Sysmiss | 112 |