| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 |
0%
|
|
| 2 | Concrete | 458 |
37.3%
|
| 3 | Logs | 17 |
1.4%
|
| 4 | None | 115 |
9.4%
|
| 5 | Other (please specify) | 1 |
0.1%
|
| 6 | Plastic | 600 |
48.8%
|
| 7 | Wood | 38 |
3.1%
|
| Sysmiss | 245 |