| Value | Category | Cases | |
|---|---|---|---|
| 1 | Concrete | 1 |
0.2%
|
| 2 | Wood | 32 |
7.9%
|
| 3 | Metal sheet/Zinks | 219 |
54.3%
|
| 4 | Tile | 47 |
11.7%
|
| 5 | Grass | 87 |
21.6%
|
| 6 | Leaves | 7 |
1.7%
|
| 7 | Other, Specify | 10 |
2.5%
|
| Sysmiss | 1 |