| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
56.3%
|
| 1 | One hour or less | 4 |
25%
|
| 3 | 1 |
6.3%
|
|
| 5 | 2 |
12.5%
|
|
| Sysmiss | 582 |