| Value | Category | Cases | |
|---|---|---|---|
| -77 | Other, specify | 0 |
0%
|
| 1 | Sand | 25 |
0.8%
|
| 2 | Smooth mud | 2741 |
85.5%
|
| 3 | Smooth cement | 436 |
13.6%
|
| 4 | Wood | 0 |
0%
|
| 5 | Tile | 2 |
0.1%
|
| Sysmiss | 51 |