| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.5%
|
| 1 | One month or less | 11 |
5.4%
|
| 2 | 12 |
5.9%
|
|
| 3 | 63 |
30.7%
|
|
| 4 | 22 |
10.7%
|
|
| 5 | 18 |
8.8%
|
|
| 6 | 52 |
25.4%
|
|
| 7 | 3 |
1.5%
|
|
| 8 | 5 |
2.4%
|
|
| 9 | 5 |
2.4%
|
|
| 12 | 11 |
5.4%
|
|
| Sysmiss | 802 |