| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
2%
|
| 1 | One hour or less | 13 |
13.3%
|
| 2 | 8 |
8.2%
|
|
| 3 | 6 |
6.1%
|
|
| 4 | 7 |
7.1%
|
|
| 5 | 7 |
7.1%
|
|
| 6 | 12 |
12.2%
|
|
| 8 | 12 |
12.2%
|
|
| 10 | 1 |
1%
|
|
| 12 | 12 |
12.2%
|
|
| 16 | 1 |
1%
|
|
| 24 | 14 |
14.3%
|
|
| 48 | 1 |
1%
|
|
| 72 | 1 |
1%
|
|
| 480 | 1 |
1%
|
|
| Sysmiss | 2537 |