| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
11.1%
|
| 1 | One hour or less | 53 |
53.5%
|
| 2 | 8 |
8.1%
|
|
| 3 | 13 |
13.1%
|
|
| 4 | 1 |
1%
|
|
| 8 | 1 |
1%
|
|
| 12 | 1 |
1%
|
|
| 14 | 1 |
1%
|
|
| 16 | 1 |
1%
|
|
| 24 | 6 |
6.1%
|
|
| 48 | 2 |
2%
|
|
| 120 | 1 |
1%
|
|
| Sysmiss | 412 |