| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 96 |
4%
|
| 2 | Very poor | 592 |
24.7%
|
| 3 | Poor | 360 |
15%
|
| 4 | Fair | 560 |
23.3%
|
| 5 | Good | 504 |
21%
|
| 6 | Very good | 288 |
12%
|