| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 24 |
2%
|
| 2 | Very poor | 336 |
28%
|
| 3 | Poor | 200 |
16.7%
|
| 4 | Fair | 168 |
14%
|
| 5 | Good | 336 |
28%
|
| 6 | Very good | 120 |
10%
|
| 7 | Not applicable | 16 |
1.3%
|