| Value | Category | Cases | |
|---|---|---|---|
| 1 | clean stone | 302 |
23.6%
|
| 2 | stone & cement | 79 |
6.2%
|
| 3 | old stone | 71 |
5.5%
|
| 4 | cement cob | 753 |
58.8%
|
| 5 | concrete | 74 |
5.8%
|
| 6 | mud | 1 |
0.1%
|
| 7 | other (specify)…… | 1 |
0.1%
|