| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
11.1%
|
| 1 | One hour or less | 8 |
44.4%
|
| 2 | 2 |
11.1%
|
|
| 4 | 2 |
11.1%
|
|
| 5 | 2 |
11.1%
|
|
| 10 | 1 |
5.6%
|
|
| 24 | 1 |
5.6%
|
|
| Sysmiss | 1645 |