| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
8.4%
|
| 0 | Less than one day | 8 |
4.5%
|
| 1 | 18 |
10.1%
|
|
| 2 | 22 |
12.4%
|
|
| 3 | 12 |
6.7%
|
|
| 4 | 10 |
5.6%
|
|
| 5 | 10 |
5.6%
|
|
| 6 | 4 |
2.2%
|
|
| 7 | 24 |
13.5%
|
|
| 9 | 1 |
0.6%
|
|
| 10 | 14 |
7.9%
|
|
| 12 | 3 |
1.7%
|
|
| 15 | 9 |
5.1%
|
|
| 20 | 5 |
2.8%
|
|
| 25 | 4 |
2.2%
|
|
| 28 | 1 |
0.6%
|
|
| 30 | 12 |
6.7%
|
|
| 40 | 1 |
0.6%
|
|
| 45 | 1 |
0.6%
|
|
| 50 | 1 |
0.6%
|
|
| 60 | 1 |
0.6%
|
|
| 90 | 2 |
1.1%
|
|
| Sysmiss | 850 |