| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
6.4%
|
| 1 | One hour or less | 6 |
7.7%
|
| 2 | 10 |
12.8%
|
|
| 3 | 4 |
5.1%
|
|
| 4 | 3 |
3.8%
|
|
| 5 | 6 |
7.7%
|
|
| 6 | 5 |
6.4%
|
|
| 7 | 1 |
1.3%
|
|
| 8 | 5 |
6.4%
|
|
| 9 | 1 |
1.3%
|
|
| 12 | 8 |
10.3%
|
|
| 15 | 3 |
3.8%
|
|
| 24 | 14 |
17.9%
|
|
| 48 | 6 |
7.7%
|
|
| 72 | 1 |
1.3%
|
|
| Sysmiss | 651 |