| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
17.5%
|
| -7 | Does not apply (spontaneous) | 2 |
5%
|
| 0 | Less than one day | 13 |
32.5%
|
| 1 | 4 |
10%
|
|
| 2 | 6 |
15%
|
|
| 3 | 2 |
5%
|
|
| 4 | 1 |
2.5%
|
|
| 5 | 2 |
5%
|
|
| 6 | 1 |
2.5%
|
|
| 7 | 2 |
5%
|
|
| Sysmiss | 328 |