| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1156 | 
                                    
                                    96.3%
                                 | 
| 1 | Once or twice | 27 | 
                                    
                                    2.3%
                                 | 
| 2 | Several times | 14 | 
                                    
                                    1.2%
                                 | 
| 3 | Many times | 2 | 
                                    
                                    0.2%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |