| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
3.2%
|
| 1 | One month or less | 26 |
9.4%
|
| 2 | 9 |
3.2%
|
|
| 3 | 54 |
19.5%
|
|
| 4 | 4 |
1.4%
|
|
| 5 | 2 |
0.7%
|
|
| 6 | 45 |
16.2%
|
|
| 8 | 1 |
0.4%
|
|
| 10 | 4 |
1.4%
|
|
| 11 | 6 |
2.2%
|
|
| 12 | 117 |
42.2%
|
|
| Sysmiss | 323 |