| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
7.7%
|
| 1 | One hour or less | 1 |
7.7%
|
| 2 | 1 |
7.7%
|
|
| 3 | 1 |
7.7%
|
|
| 4 | 1 |
7.7%
|
|
| 5 | 2 |
15.4%
|
|
| 8 | 1 |
7.7%
|
|
| 12 | 3 |
23.1%
|
|
| 18 | 1 |
7.7%
|
|
| 24 | 1 |
7.7%
|
|
| Sysmiss | 351 |