| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | One hour or less | 16 |
32%
|
| 2 | 6 |
12%
|
|
| 3 | 5 |
10%
|
|
| 4 | 1 |
2%
|
|
| 5 | 2 |
4%
|
|
| 6 | 4 |
8%
|
|
| 8 | 5 |
10%
|
|
| 9 | 1 |
2%
|
|
| 12 | 1 |
2%
|
|
| 15 | 3 |
6%
|
|
| 30 | 4 |
8%
|
|
| 120 | 1 |
2%
|
|
| 180 | 1 |
2%
|
|
| Sysmiss | 112 |