| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 655 | 
                                    
                                    54.6%
                                 | 
| 1 | Just once or twice | 143 | 
                                    
                                    11.9%
                                 | 
| 2 | Several times | 223 | 
                                    
                                    18.6%
                                 | 
| 3 | Many times | 95 | 
                                    
                                    7.9%
                                 | 
| 4 | Always | 83 | 
                                    
                                    6.9%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |