| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
3.5%
|
| 1 | One month or less | 42 |
16.3%
|
| 2 | 61 |
23.7%
|
|
| 3 | 61 |
23.7%
|
|
| 4 | 20 |
7.8%
|
|
| 5 | 6 |
2.3%
|
|
| 6 | 28 |
10.9%
|
|
| 7 | 3 |
1.2%
|
|
| 8 | 6 |
2.3%
|
|
| 9 | 4 |
1.6%
|
|
| 10 | 3 |
1.2%
|
|
| 12 | 14 |
5.4%
|
|
| Sysmiss | 343 |