| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 45 | 
                                    
                                    86.5%
                                 | 
| 2 | Several times | 7 | 
                                    
                                    13.5%
                                 | 
| Sysmiss | DK | 0 | |
| Sysmiss | RF | 0 | |
| Sysmiss | 1288 |