| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
9.1%
|
| 1 | Less than one day | 2 |
6.1%
|
| 2 | 1 |
3%
|
|
| 3 | 1 |
3%
|
|
| 6 | 1 |
3%
|
|
| 7 | 1 |
3%
|
|
| 15 | 2 |
6.1%
|
|
| 18 | 1 |
3%
|
|
| 20 | 4 |
12.1%
|
|
| 25 | 4 |
12.1%
|
|
| 30 | 5 |
15.2%
|
|
| 35 | 1 |
3%
|
|
| 60 | 1 |
3%
|
|
| 90 | 5 |
15.2%
|
|
| 180 | 1 |
3%
|
|
| Sysmiss | 965 |