| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1%
|
| -7 | Does not apply (spontaneous) | 15 |
15%
|
| 0 | Less than one day | 20 |
20%
|
| 1 | 15 |
15%
|
|
| 2 | 19 |
19%
|
|
| 3 | 11 |
11%
|
|
| 4 | 1 |
1%
|
|
| 7 | 6 |
6%
|
|
| 10 | 5 |
5%
|
|
| 14 | 3 |
3%
|
|
| 28 | 2 |
2%
|
|
| 60 | 1 |
1%
|
|
| 90 | 1 |
1%
|
|
| Sysmiss | 192 |