| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
6.1%
|
| 1 | One month or less | 16 |
32.7%
|
| 2 | 8 |
16.3%
|
|
| 3 | 11 |
22.4%
|
|
| 4 | 3 |
6.1%
|
|
| 5 | 2 |
4.1%
|
|
| 6 | 1 |
2%
|
|
| 8 | 2 |
4.1%
|
|
| 11 | 2 |
4.1%
|
|
| 12 | 1 |
2%
|
|
| Sysmiss | 71 |