| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.2%
|
| 0 | Less than 1 hour | 16 |
35.6%
|
| 1 | 9 |
20%
|
|
| 2 | 4 |
8.9%
|
|
| 3 | 3 |
6.7%
|
|
| 4 | 4 |
8.9%
|
|
| 6 | 1 |
2.2%
|
|
| 7 | 2 |
4.4%
|
|
| 13 | 1 |
2.2%
|
|
| 24 | 1 |
2.2%
|
|
| 30 | 2 |
4.4%
|
|
| 48 | 1 |
2.2%
|
|
| Sysmiss | 105 |