| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
8.4%
|
| 1 | One month or less | 17 |
20.5%
|
| 2 | 14 |
16.9%
|
|
| 3 | 19 |
22.9%
|
|
| 4 | 4 |
4.8%
|
|
| 5 | 2 |
2.4%
|
|
| 6 | 9 |
10.8%
|
|
| 7 | 2 |
2.4%
|
|
| 8 | 4 |
4.8%
|
|
| 9 | 1 |
1.2%
|
|
| 10 | 1 |
1.2%
|
|
| 12 | 3 |
3.6%
|
|
| Sysmiss | 274 |