| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 395 |
16.9%
|
| 1 | Once | 303 |
13%
|
| 2 | Twice | 364 |
15.6%
|
| 3 | Three times | 282 |
12.1%
|
| 4 | More than three times | 988 |
42.4%
|
| Sysmiss | 2890 |