| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 64 |
2.7%
|
| 2 | Very poor | 320 |
13.3%
|
| 3 | Poor | 344 |
14.3%
|
| 4 | Fair | 896 |
37.3%
|
| 5 | Good | 440 |
18.3%
|
| 6 | Very good | 320 |
13.3%
|
| 7 | Not applicable | 16 |
0.7%
|