| Value | Category | Cases | |
|---|---|---|---|
| -1000 | Does not apply (SPONTANEOUS) | 6 |
1.3%
|
| -9 | Don’t know (SPONTANEOUS) | 16 |
3.4%
|
| 1 | Not a challenge | 87 |
18.4%
|
| 2 | Minor challenge | 28 |
5.9%
|
| 3 | Moderate challenge | 81 |
17.1%
|
| 4 | Major challenge | 255 |
53.9%
|
| Sysmiss | 198 |