| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
7.5%
|
| 0 | Less than one day | 2 |
5%
|
| 1 | 6 |
15%
|
|
| 2 | 5 |
12.5%
|
|
| 3 | 8 |
20%
|
|
| 4 | 5 |
12.5%
|
|
| 5 | 6 |
15%
|
|
| 7 | 3 |
7.5%
|
|
| 21 | 1 |
2.5%
|
|
| 30 | 1 |
2.5%
|
|
| Sysmiss | 112 |