| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 102 | 
                                    
                                    0.8%
                                 | 
| -8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| -5 | Not applicable | 0 | 
                                    
                                    0%
                                 | 
| -3 | Missing | 11 | 
                                    
                                    0.1%
                                 | 
| 1 | Once | 3682 | 
                                    
                                    28.3%
                                 | 
| 2 | More than once | 4745 | 
                                    
                                    36.4%
                                 | 
| 3 | Never | 4492 | 
                                    
                                    34.5%
                                 | 
| Sysmiss | 939 |