| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
6.5%
|
| 1 | One hour or less | 11 |
35.5%
|
| 2 | 7 |
22.6%
|
|
| 3 | 1 |
3.2%
|
|
| 4 | 2 |
6.5%
|
|
| 5 | 1 |
3.2%
|
|
| 6 | 1 |
3.2%
|
|
| 12 | 1 |
3.2%
|
|
| 24 | 2 |
6.5%
|
|
| 30 | 1 |
3.2%
|
|
| 59 | 1 |
3.2%
|
|
| 72 | 1 |
3.2%
|
|
| Sysmiss | 334 |