| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 7 |
2.5%
|
| 0 | 193 |
68%
|
|
| 1 | 8 |
2.8%
|
|
| 3 | 2 |
0.7%
|
|
| 5 | 16 |
5.6%
|
|
| 6 | 1 |
0.4%
|
|
| 7 | 1 |
0.4%
|
|
| 10 | 11 |
3.9%
|
|
| 15 | 4 |
1.4%
|
|
| 16 | 1 |
0.4%
|
|
| 20 | 19 |
6.7%
|
|
| 30 | 5 |
1.8%
|
|
| 40 | 1 |
0.4%
|
|
| 50 | 7 |
2.5%
|
|
| 60 | 3 |
1.1%
|
|
| 70 | 1 |
0.4%
|
|
| 80 | 2 |
0.7%
|
|
| 100 | 2 |
0.7%
|
|
| Sysmiss | 76 |