| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
0.4%
|
| -9 | Don't know (spontaneous) | 36 |
15.5%
|
| 0 | 6 |
2.6%
|
|
| 2 | 5 |
2.1%
|
|
| 3 | 7 |
3%
|
|
| 4 | 26 |
11.2%
|
|
| 5 | 39 |
16.7%
|
|
| 6 | 15 |
6.4%
|
|
| 7 | 21 |
9%
|
|
| 8 | 20 |
8.6%
|
|
| 9 | 2 |
0.9%
|
|
| 10 | 15 |
6.4%
|
|
| 11 | 1 |
0.4%
|
|
| 12 | 3 |
1.3%
|
|
| 14 | 2 |
0.9%
|
|
| 15 | 8 |
3.4%
|
|
| 16 | 1 |
0.4%
|
|
| 20 | 8 |
3.4%
|
|
| 21 | 1 |
0.4%
|
|
| 25 | 1 |
0.4%
|
|
| 26 | 1 |
0.4%
|
|
| 30 | 1 |
0.4%
|
|
| 40 | 2 |
0.9%
|
|
| 52 | 10 |
4.3%
|
|
| 80 | 1 |
0.4%
|
|
| Sysmiss | 127 |