| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 32 |
2.7%
|
| 2 | Very poor | 320 |
26.7%
|
| 3 | Poor | 352 |
29.3%
|
| 4 | Fair | 344 |
28.7%
|
| 5 | Good | 104 |
8.7%
|
| 6 | Very good | 48 |
4%
|