| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
10.2%
|
| 1 | Less than one day | 1 |
2%
|
| 2 | 1 |
2%
|
|
| 3 | 2 |
4.1%
|
|
| 5 | 1 |
2%
|
|
| 6 | 1 |
2%
|
|
| 7 | 1 |
2%
|
|
| 15 | 9 |
18.4%
|
|
| 20 | 3 |
6.1%
|
|
| 30 | 11 |
22.4%
|
|
| 40 | 1 |
2%
|
|
| 60 | 5 |
10.2%
|
|
| 90 | 5 |
10.2%
|
|
| 180 | 3 |
6.1%
|
|
| Sysmiss | 674 |