| Value | Category | Cases | |
|---|---|---|---|
| 1 | No problems | 2845 |
99%
|
| 2 | Little difficulty | 13 |
0.5%
|
| 3 | Moderate difficulty | 2 |
0.1%
|
| 4 | Serious difficulty | 3 |
0.1%
|
| 9 | Missing | 11 |
0.4%
|