| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 72 |
6%
|
| 2 | Very poor | 136 |
11.3%
|
| 3 | Poor | 120 |
10%
|
| 4 | Fair | 431 |
35.9%
|
| 5 | Good | 400 |
33.4%
|
| 6 | Very good | 40 |
3.3%
|