| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | Less than 1 hour | 23 |
65.7%
|
| 1 | 4 |
11.4%
|
|
| 2 | 4 |
11.4%
|
|
| 3 | 2 |
5.7%
|
|
| 5 | 2 |
5.7%
|
|
| Sysmiss | 128 |