| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -6 | Still in progress | 0 |
0%
|
| 1 | One week or less | 5 |
3.8%
|
| 2 | 51 |
38.6%
|
|
| 4 | 76 |
57.6%
|
|
| Sysmiss | 387 |