| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| 1 | One month or less | 58 |
14.9%
|
| 2 | 45 |
11.5%
|
|
| 3 | 70 |
17.9%
|
|
| 4 | 31 |
7.9%
|
|
| 5 | 14 |
3.6%
|
|
| 6 | 67 |
17.2%
|
|
| 7 | 7 |
1.8%
|
|
| 8 | 14 |
3.6%
|
|
| 9 | 18 |
4.6%
|
|
| 10 | 11 |
2.8%
|
|
| 11 | 3 |
0.8%
|
|
| 12 | 49 |
12.6%
|
|
| 24 | 1 |
0.3%
|
|
| Sysmiss | 1042 |