| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 0 |
0%
|
| 2 | Very poor | 128 |
10.7%
|
| 3 | Poor | 320 |
26.7%
|
| 4 | Fair | 464 |
38.7%
|
| 5 | Good | 175 |
14.6%
|
| 6 | Very good | 112 |
9.3%
|