| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 273 |
25.9%
|
| 2 | Twice | 417 |
39.6%
|
| 3 | Three times | 227 |
21.5%
|
| 4 | Four times | 63 |
6%
|
| 5 | Other | 67 |
6.4%
|
| 6 | Refused | 2 |
0.2%
|
| 7 | Data not entered | 5 |
0.5%
|
| Sysmiss | 15 |