| Value | Category | Cases | |
|---|---|---|---|
| 1 | Mud | 124 |
73.4%
|
| 2 | Wooden planks | 8 |
4.7%
|
| 3 | Stone/brick/cement | 35 |
20.7%
|
| 4 | Other (specify) | 2 |
1.2%
|
| Sysmiss | 81 |