| Value | Category | Cases | |
|---|---|---|---|
| 1 | straw/wood | 4 |
0.7%
|
| 2 | cement/concrete | 313 |
53.2%
|
| 3 | sheet metal | 268 |
45.6%
|
| 97 | Other, specify | 2 |
0.3%
|
| 98 | Don't know/Not sure | 1 |
0.2%
|