| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 587 |
75.2%
|
| 2 | Twice | 114 |
14.6%
|
| 3 | Three | 67 |
8.6%
|
| 4 | Other (mention | 13 |
1.7%
|
| Sysmiss | 1602 |