| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
5.4%
|
| 0 | 12 |
32.4%
|
|
| 1 | One minute or less | 2 |
5.4%
|
| 5 | 2 |
5.4%
|
|
| 10 | 3 |
8.1%
|
|
| 15 | 1 |
2.7%
|
|
| 20 | 1 |
2.7%
|
|
| 24 | 1 |
2.7%
|
|
| 30 | 4 |
10.8%
|
|
| 45 | 1 |
2.7%
|
|
| 59 | 8 |
21.6%
|
|
| Sysmiss | 231 |