| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 128 |
8.4%
|
| 1 | Once | 118 |
7.7%
|
| 2 | Two to four times | 698 |
45.6%
|
| 3 | More than four times | 587 |
38.3%
|
| Sysmiss | 16420 |