| Value | Category | Cases | |
|---|---|---|---|
| 1 | Sand | 2254 |
23.3%
|
| 2 | Concrete | 5560 |
57.6%
|
| 3 | Mud, clay and /or cow dung | 1727 |
17.9%
|
| 4 | Wood | 74 |
0.8%
|
| 5 | Other, specify | 40 |
0.4%
|
| 9 | Not stated | 1 |
0%
|