| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 44 |
2.8%
|
| 2 | Very poor | 259 |
16.4%
|
| 3 | Poor | 255 |
16.1%
|
| 4 | Fair | 397 |
25.1%
|
| 5 | Good | 411 |
26%
|
| 6 | Very good | 214 |
13.5%
|