| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 88 |
7.3%
|
| 2 | Very poor | 376 |
31.3%
|
| 3 | Poor | 216 |
18%
|
| 4 | Fair | 248 |
20.7%
|
| 5 | Good | 232 |
19.3%
|
| 6 | Very good | 40 |
3.3%
|