| Value | Category | Cases | |
|---|---|---|---|
| -99 | -99 (Don't know) | 0 |
0%
|
| -88 | Other, specify | 1 |
0.1%
|
| -66 | -66 (refuse to answer) | 0 |
0%
|
| 1 | Mud/Earth/Sand | 739 |
53.6%
|
| 2 | Clay | 65 |
4.7%
|
| 3 | Cement/Concrete | 574 |
41.6%
|