| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
13%
|
| 0 | Less than one day | 0 |
0%
|
| 3 | 2 |
8.7%
|
|
| 5 | 5 |
21.7%
|
|
| 7 | 3 |
13%
|
|
| 10 | 4 |
17.4%
|
|
| 12 | 1 |
4.3%
|
|
| 15 | 3 |
13%
|
|
| 17 | 1 |
4.3%
|
|
| 18 | 1 |
4.3%
|
|
| Sysmiss | 626 |