| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1133 | 
                                    
                                    94.4%
                                 | 
| 1 | Once or twice | 26 | 
                                    
                                    2.2%
                                 | 
| 2 | Several times | 26 | 
                                    
                                    2.2%
                                 | 
| 3 | Many times | 13 | 
                                    
                                    1.1%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 2 | 
                                    
                                    0.2%
                                 |