| Value | Category | Cases | |
|---|---|---|---|
| 1 | Bricks | 276 |
74%
|
| 2 | Don't know | 1 |
0.3%
|
| 3 | Fabric | 3 |
0.8%
|
| 4 | Metal | 17 |
4.6%
|
| 5 | None | 2 |
0.5%
|
| 6 | Plastic sheeting | 74 |
19.8%
|
| Missing value | 7 |