| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.7%
|
| 1 | One month or less | 14 |
10%
|
| 2 | 18 |
12.9%
|
|
| 3 | 35 |
25%
|
|
| 4 | 14 |
10%
|
|
| 5 | 16 |
11.4%
|
|
| 6 | 24 |
17.1%
|
|
| 7 | 4 |
2.9%
|
|
| 8 | 5 |
3.6%
|
|
| 10 | 1 |
0.7%
|
|
| 11 | 1 |
0.7%
|
|
| 12 | 7 |
5%
|
|
| Sysmiss | 218 |