| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don’t know (SPONTANEOUS) | 1 |
25%
|
| 1 | <1 month | 0 |
0%
|
| 2 | 1-3 months | 3 |
75%
|
| 3 | 4-6 months | 0 |
0%
|
| 4 | >6 months | 0 |
0%
|
| Sysmiss | 667 |