| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.6%
|
| 0 | 26 |
66.7%
|
|
| 1 | One minute or less | 4 |
10.3%
|
| 15 | 1 |
2.6%
|
|
| 20 | 1 |
2.6%
|
|
| 30 | 5 |
12.8%
|
|
| 59 | 1 |
2.6%
|
|
| Sysmiss | 64 |