| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
7.4%
|
| 1 | One hour or less | 16 |
29.6%
|
| 2 | 4 |
7.4%
|
|
| 3 | 2 |
3.7%
|
|
| 4 | 5 |
9.3%
|
|
| 5 | 1 |
1.9%
|
|
| 6 | 2 |
3.7%
|
|
| 8 | 5 |
9.3%
|
|
| 12 | 2 |
3.7%
|
|
| 24 | 7 |
13%
|
|
| 36 | 1 |
1.9%
|
|
| 48 | 2 |
3.7%
|
|
| 64 | 1 |
1.9%
|
|
| 72 | 2 |
3.7%
|
|
| Sysmiss | 161 |