| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
1.2%
|
| 0 | 247 |
35.5%
|
|
| 1 | 348 |
50.1%
|
|
| 2 | 58 |
8.3%
|
|
| 3 | 13 |
1.9%
|
|
| 4 | 10 |
1.4%
|
|
| 5 | 1 |
0.1%
|
|
| 6 | 1 |
0.1%
|
|
| 7 | 2 |
0.3%
|
|
| 10 | 3 |
0.4%
|
|
| 12 | 1 |
0.1%
|
|
| 15 | 2 |
0.3%
|
|
| 16 | 1 |
0.1%
|
|
| Sysmiss | 2002 |