| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | Less than one day | 0 |
0%
|
| 8 | 1 |
1.2%
|
|
| 15 | 26 |
31.3%
|
|
| 20 | 35 |
42.2%
|
|
| 22 | 4 |
4.8%
|
|
| 23 | 1 |
1.2%
|
|
| 25 | 9 |
10.8%
|
|
| 30 | 7 |
8.4%
|
|
| Sysmiss | 436 |