| Value | Category | Cases | |
|---|---|---|---|
| 11 | Earth, sand, soil | 2871 |
28.4%
|
| 12 | Dung | 26 |
0.3%
|
| 21 | Wood planks | 5623 |
55.7%
|
| 32 | Concrete, vinyl or asphalt strips | 938 |
9.3%
|
| 34 | Cement | 577 |
5.7%
|
| 96 | Other | 44 |
0.4%
|
| 99 | Missing | 13 |
0.1%
|
| Sysmiss | 408 |