| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | One hour or less | 7 |
25%
|
| 2 | 6 |
21.4%
|
|
| 5 | 3 |
10.7%
|
|
| 6 | 2 |
7.1%
|
|
| 7 | 2 |
7.1%
|
|
| 8 | 2 |
7.1%
|
|
| 15 | 1 |
3.6%
|
|
| 18 | 1 |
3.6%
|
|
| 20 | 1 |
3.6%
|
|
| 24 | 1 |
3.6%
|
|
| 30 | 1 |
3.6%
|
|
| 48 | 1 |
3.6%
|
|
| Sysmiss | 1172 |