| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
0.4%
|
| -9 | Don't know (spontaneous) | 37 |
15.9%
|
| 0 | 9 |
3.9%
|
|
| 1 | 6 |
2.6%
|
|
| 2 | 20 |
8.6%
|
|
| 3 | 32 |
13.7%
|
|
| 4 | 40 |
17.2%
|
|
| 5 | 35 |
15%
|
|
| 6 | 16 |
6.9%
|
|
| 7 | 9 |
3.9%
|
|
| 8 | 5 |
2.1%
|
|
| 9 | 3 |
1.3%
|
|
| 10 | 7 |
3%
|
|
| 12 | 2 |
0.9%
|
|
| 13 | 1 |
0.4%
|
|
| 14 | 1 |
0.4%
|
|
| 15 | 2 |
0.9%
|
|
| 20 | 1 |
0.4%
|
|
| 21 | 1 |
0.4%
|
|
| 26 | 3 |
1.3%
|
|
| 28 | 1 |
0.4%
|
|
| 35 | 1 |
0.4%
|
|
| Sysmiss | 127 |