| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.9%
|
| 1 | One hour or less | 5 |
14.3%
|
| 2 | 6 |
17.1%
|
|
| 3 | 4 |
11.4%
|
|
| 4 | 2 |
5.7%
|
|
| 5 | 3 |
8.6%
|
|
| 6 | 1 |
2.9%
|
|
| 10 | 3 |
8.6%
|
|
| 13 | 1 |
2.9%
|
|
| 16 | 1 |
2.9%
|
|
| 24 | 4 |
11.4%
|
|
| 30 | 2 |
5.7%
|
|
| 48 | 1 |
2.9%
|
|
| 60 | 1 |
2.9%
|
|
| Sysmiss | 1204 |