| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
11.1%
|
| 1 | One hour or less | 2 |
22.2%
|
| 3 | 2 |
22.2%
|
|
| 4 | 3 |
33.3%
|
|
| 24 | 1 |
11.1%
|
|
| Sysmiss | 841 |