| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 5 | 4 |
3.3%
|
|
| 10 | 7 |
5.8%
|
|
| 12 | 1 |
0.8%
|
|
| 15 | 6 |
5%
|
|
| 18 | 2 |
1.7%
|
|
| 20 | 17 |
14.2%
|
|
| 23 | 1 |
0.8%
|
|
| 25 | 7 |
5.8%
|
|
| 30 | 9 |
7.5%
|
|
| 35 | 4 |
3.3%
|
|
| 40 | 10 |
8.3%
|
|
| 50 | 20 |
16.7%
|
|
| 60 | 7 |
5.8%
|
|
| 65 | 1 |
0.8%
|
|
| 70 | 1 |
0.8%
|
|
| 75 | 4 |
3.3%
|
|
| 80 | 9 |
7.5%
|
|
| 90 | 4 |
3.3%
|
|
| 98 | 1 |
0.8%
|
|
| 100 | 5 |
4.2%
|
|
| Sysmiss | 225 |