| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
5.7%
|
| 0 | 27 |
77.1%
|
|
| 1 | One minute or less | 2 |
5.7%
|
| 10 | 1 |
2.9%
|
|
| 30 | 3 |
8.6%
|
|
| Sysmiss | 117 |