| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 490 |
9.8%
|
| 2 | Twice | 269 |
5.4%
|
| 3 | Three times or more | 310 |
6.2%
|
| 98 | Don't Know | 81 |
1.6%
|
| 99 | Not Applicable | 3860 |
77%
|
| Sysmiss | 28440 |