| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.6%
|
| 0 | Less than 1 hour | 20 |
31.3%
|
| 1 | 18 |
28.1%
|
|
| 2 | 8 |
12.5%
|
|
| 3 | 2 |
3.1%
|
|
| 4 | 4 |
6.3%
|
|
| 5 | 4 |
6.3%
|
|
| 8 | 4 |
6.3%
|
|
| 10 | 1 |
1.6%
|
|
| 18 | 1 |
1.6%
|
|
| 24 | 1 |
1.6%
|
|
| Sysmiss | 195 |