| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 4 | 
                                    
                                    0.4%
                                 | 
| -8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| -5 | Not applicable | 0 | 
                                    
                                    0%
                                 | 
| -3 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Once | 237 | 
                                    
                                    26%
                                 | 
| 2 | More than once | 305 | 
                                    
                                    33.4%
                                 | 
| 3 | Never | 367 | 
                                    
                                    40.2%
                                 | 
| Sysmiss | 86 |