| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 0 |
0%
|
| 2 | Very poor | 112 |
9.3%
|
| 3 | Poor | 88 |
7.3%
|
| 4 | Fair | 160 |
13.3%
|
| 5 | Good | 536 |
44.7%
|
| 6 | Very good | 304 |
25.3%
|