| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.9%
|
| 0 | Less than 1 hour | 14 |
26.9%
|
| 1 | 14 |
26.9%
|
|
| 2 | 10 |
19.2%
|
|
| 3 | 5 |
9.6%
|
|
| 4 | 3 |
5.8%
|
|
| 5 | 2 |
3.8%
|
|
| 6 | 1 |
1.9%
|
|
| 24 | 1 |
1.9%
|
|
| 360 | 1 |
1.9%
|
|
| Sysmiss | 105 |