| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 8 |
0.5%
|
| 2 | Very poor | 200 |
12.5%
|
| 3 | Poor | 152 |
9.5%
|
| 4 | Fair | 464 |
29%
|
| 5 | Good | 560 |
35%
|
| 6 | Very good | 216 |
13.5%
|