| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
9.9%
|
| -7 | Does not apply (spontaneous) | 7 |
6.9%
|
| 0 | Less than one day | 52 |
51.5%
|
| 1 | 19 |
18.8%
|
|
| 2 | 9 |
8.9%
|
|
| 3 | 1 |
1%
|
|
| 4 | 1 |
1%
|
|
| 30 | 2 |
2%
|
|
| Sysmiss | 373 |