| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1098 | 
                                    
                                    91.5%
                                 | 
| 1 | Once | 82 | 
                                    
                                    6.8%
                                 | 
| 2 | Twice | 12 | 
                                    
                                    1%
                                 | 
| 3 | Three or more times | 7 | 
                                    
                                    0.6%
                                 | 
| 9 | Don't know / Can't remember | 1 | 
                                    
                                    0.1%
                                 | 
| 98 | Refused | 0 | 
                                    
                                    0%
                                 |