| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 88 |
3.7%
|
| 2 | Very poor | 416 |
17.3%
|
| 3 | Poor | 408 |
17%
|
| 4 | Fair | 664 |
27.7%
|
| 5 | Good | 576 |
24%
|
| 6 | Very good | 248 |
10.3%
|