| Value | Category | Cases | |
|---|---|---|---|
| 1 | Concrete/Reinforced concrete | 3176 |
98.6%
|
| 2 | Metal | 17 |
0.5%
|
| 3 | Wood | 1 |
0%
|
| 4 | Asbestos/Fibrous cement | 6 |
0.2%
|
| 5 | Thatch/Palm fronds | 4 |
0.1%
|
| 6 | Other, specify | 14 |
0.4%
|
| Sysmiss | 2 |