| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1415 | 
                                    
                                    59%
                                 | 
| 1 | Only once | 147 | 
                                    
                                    6.1%
                                 | 
| 2 | A few times | 428 | 
                                    
                                    17.8%
                                 | 
| 3 | Often | 404 | 
                                    
                                    16.8%
                                 | 
| 8 | Refused | 2 | 
                                    
                                    0.1%
                                 | 
| 9 | Don’t know | 4 | 
                                    
                                    0.2%
                                 |