| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
4%
|
| -7 | Does not apply (spontaneous) | 2 |
8%
|
| 0 | Less than one day | 4 |
16%
|
| 1 | 8 |
32%
|
|
| 2 | 5 |
20%
|
|
| 3 | 3 |
12%
|
|
| 10 | 1 |
4%
|
|
| 12 | 1 |
4%
|
|
| Sysmiss | 338 |