| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 40 |
1.7%
|
| 2 | Very poor | 472 |
19.7%
|
| 3 | Poor | 392 |
16.3%
|
| 4 | Fair | 544 |
22.7%
|
| 5 | Good | 416 |
17.3%
|
| 6 | Very good | 536 |
22.3%
|