| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
3.1%
|
| 1 | One hour or less | 9 |
14.1%
|
| 2 | 1 |
1.6%
|
|
| 3 | 7 |
10.9%
|
|
| 4 | 7 |
10.9%
|
|
| 5 | 9 |
14.1%
|
|
| 6 | 4 |
6.3%
|
|
| 7 | 1 |
1.6%
|
|
| 8 | 2 |
3.1%
|
|
| 10 | 2 |
3.1%
|
|
| 12 | 3 |
4.7%
|
|
| 18 | 1 |
1.6%
|
|
| 21 | 1 |
1.6%
|
|
| 24 | 9 |
14.1%
|
|
| 48 | 5 |
7.8%
|
|
| 72 | 1 |
1.6%
|
|
| Sysmiss | 915 |