| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
7.5%
|
| 0 | Less than one day | 2 |
5%
|
| 1 | 4 |
10%
|
|
| 2 | 9 |
22.5%
|
|
| 3 | 4 |
10%
|
|
| 5 | 4 |
10%
|
|
| 7 | 9 |
22.5%
|
|
| 8 | 1 |
2.5%
|
|
| 10 | 2 |
5%
|
|
| 15 | 2 |
5%
|
|
| Sysmiss | 314 |