| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 18 |
4.5%
|
| 1 | One month or less | 19 |
4.7%
|
| 2 | 20 |
5%
|
|
| 3 | 47 |
11.7%
|
|
| 4 | 16 |
4%
|
|
| 5 | 8 |
2%
|
|
| 6 | 102 |
25.4%
|
|
| 7 | 7 |
1.7%
|
|
| 8 | 16 |
4%
|
|
| 9 | 26 |
6.5%
|
|
| 10 | 10 |
2.5%
|
|
| 11 | 2 |
0.5%
|
|
| 12 | 111 |
27.6%
|
|
| Sysmiss | 553 |