| Value | Category | Cases | |
|---|---|---|---|
| 1 | Flat | 9020 |
57.5%
|
| 2 | Slight slope | 5060 |
32.2%
|
| 3 | Moderate slope | 1076 |
6.9%
|
| 4 | Steep, hilly | 536 |
3.4%
|
| Sysmiss | 59 |