| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
8.6%
|
| 0 | Less than 1 hour | 16 |
45.7%
|
| 1 | 3 |
8.6%
|
|
| 2 | 4 |
11.4%
|
|
| 3 | 1 |
2.9%
|
|
| 4 | 1 |
2.9%
|
|
| 6 | 1 |
2.9%
|
|
| 8 | 1 |
2.9%
|
|
| 15 | 1 |
2.9%
|
|
| 20 | 1 |
2.9%
|
|
| 24 | 1 |
2.9%
|
|
| 30 | 1 |
2.9%
|
|
| 72 | 1 |
2.9%
|
|
| Sysmiss | 973 |