| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 1 | impassable | 1200 |
2.5%
|
| 2 | very poor | 7476 |
15.5%
|
| 3 | poor | 8091 |
16.8%
|
| 4 | fair | 12270 |
25.5%
|
| 5 | good | 12867 |
26.8%
|
| 6 | very good | 6180 |
12.9%
|