| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 0 |
0%
|
| 2 | Very poor | 456 |
38%
|
| 3 | Poor | 128 |
10.7%
|
| 4 | Fair | 160 |
13.3%
|
| 5 | Good | 248 |
20.7%
|
| 6 | Very good | 208 |
17.3%
|