| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
12.5%
|
| 0 | Less than one day | 1 |
3.1%
|
| 1 | 8 |
25%
|
|
| 2 | 8 |
25%
|
|
| 3 | 2 |
6.3%
|
|
| 4 | 1 |
3.1%
|
|
| 5 | 3 |
9.4%
|
|
| 7 | 1 |
3.1%
|
|
| 14 | 2 |
6.3%
|
|
| 20 | 1 |
3.1%
|
|
| 21 | 1 |
3.1%
|
|
| Sysmiss | 209 |