| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2%
|
| 0 | 27 |
55.1%
|
|
| 1 | One minute or less | 15 |
30.6%
|
| 10 | 1 |
2%
|
|
| 40 | 3 |
6.1%
|
|
| 50 | 1 |
2%
|
|
| 59 | 1 |
2%
|
|
| Sysmiss | 192 |