| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 0 |
0%
|
| 2 | Very poor | 144 |
12%
|
| 3 | Poor | 184 |
15.3%
|
| 4 | Fair | 168 |
14%
|
| 5 | Good | 424 |
35.3%
|
| 6 | Very good | 280 |
23.3%
|