| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
15%
|
| 0 | Less than one day | 1 |
5%
|
| 14 | 4 |
20%
|
|
| 20 | 1 |
5%
|
|
| 21 | 2 |
10%
|
|
| 24 | 1 |
5%
|
|
| 28 | 1 |
5%
|
|
| 30 | 2 |
10%
|
|
| 45 | 1 |
5%
|
|
| 51 | 1 |
5%
|
|
| 90 | 2 |
10%
|
|
| 270 | 1 |
5%
|
|
| Sysmiss | 94 |