| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 54 |
23%
|
| 0 | 144 |
61.3%
|
|
| 1 | 5 |
2.1%
|
|
| 2 | 4 |
1.7%
|
|
| 3 | 5 |
2.1%
|
|
| 4 | 2 |
0.9%
|
|
| 5 | 1 |
0.4%
|
|
| 6 | 1 |
0.4%
|
|
| 7 | 1 |
0.4%
|
|
| 9 | 1 |
0.4%
|
|
| 10 | 4 |
1.7%
|
|
| 19 | 2 |
0.9%
|
|
| 20 | 2 |
0.9%
|
|
| 30 | 2 |
0.9%
|
|
| 40 | 1 |
0.4%
|
|
| 50 | 1 |
0.4%
|
|
| 80 | 3 |
1.3%
|
|
| 120 | 1 |
0.4%
|
|
| 260 | 1 |
0.4%
|
|
| Sysmiss | 142 |