| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 8 |
0.7%
|
| 2 | Very poor | 274 |
22.8%
|
| 3 | Poor | 200 |
16.6%
|
| 4 | Fair | 353 |
29.3%
|
| 5 | Good | 345 |
28.7%
|
| 6 | Very good | 24 |
2%
|