| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Less than one day | 0 |
0%
|
| 20 | 1 |
5%
|
|
| 21 | 1 |
5%
|
|
| 30 | 5 |
25%
|
|
| 35 | 2 |
10%
|
|
| 40 | 1 |
5%
|
|
| 45 | 1 |
5%
|
|
| 60 | 3 |
15%
|
|
| 90 | 4 |
20%
|
|
| 120 | 1 |
5%
|
|
| 180 | 1 |
5%
|
|
| Sysmiss | 83 |