| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
3.4%
|
| 0 | Less than one day | 8 |
27.6%
|
| 1 | 2 |
6.9%
|
|
| 2 | 5 |
17.2%
|
|
| 3 | 3 |
10.3%
|
|
| 5 | 1 |
3.4%
|
|
| 7 | 3 |
10.3%
|
|
| 10 | 2 |
6.9%
|
|
| 15 | 1 |
3.4%
|
|
| 25 | 1 |
3.4%
|
|
| 30 | 2 |
6.9%
|
|
| Sysmiss | 999 |