| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | Less than 1 hour | 15 |
28.3%
|
| 1 | 12 |
22.6%
|
|
| 2 | 7 |
13.2%
|
|
| 3 | 8 |
15.1%
|
|
| 4 | 5 |
9.4%
|
|
| 5 | 4 |
7.5%
|
|
| 6 | 2 |
3.8%
|
|
| Sysmiss | 188 |