| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
6.9%
|
| 0 | Less than 1 hour | 11 |
37.9%
|
| 1 | 6 |
20.7%
|
|
| 2 | 1 |
3.4%
|
|
| 3 | 2 |
6.9%
|
|
| 4 | 2 |
6.9%
|
|
| 6 | 1 |
3.4%
|
|
| 12 | 1 |
3.4%
|
|
| 20 | 1 |
3.4%
|
|
| 23 | 1 |
3.4%
|
|
| 48 | 1 |
3.4%
|
|
| Sysmiss | 121 |