| Value | Category | Cases | |
|---|---|---|---|
| -98 | Don't know | 9 |
1.3%
|
| 0 | Not taken | 627 |
91.7%
|
| 1 | 1-7 times | 46 |
6.7%
|
| 2 | 8 or more times | 2 |
0.3%
|
| Sysmiss | 1587 |