| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 1 |
1.1%
|
| 2 | 1 |
1.1%
|
|
| 3 | 1 |
1.1%
|
|
| 4 | 2 |
2.2%
|
|
| 5 | 10 |
11.1%
|
|
| 6 | 1 |
1.1%
|
|
| 7 | 1 |
1.1%
|
|
| 8 | 1 |
1.1%
|
|
| 10 | 10 |
11.1%
|
|
| 12 | 1 |
1.1%
|
|
| 13 | 1 |
1.1%
|
|
| 15 | 3 |
3.3%
|
|
| 20 | 27 |
30%
|
|
| 25 | 2 |
2.2%
|
|
| 28 | 1 |
1.1%
|
|
| 30 | 18 |
20%
|
|
| 40 | 7 |
7.8%
|
|
| 50 | 1 |
1.1%
|
|
| 60 | 1 |
1.1%
|
|
| Sysmiss | 269 |