| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 43 | 
                                    
                                    3.6%
                                 | 
| 1 | Just once or twice | 35 | 
                                    
                                    2.9%
                                 | 
| 2 | Several times | 210 | 
                                    
                                    17.5%
                                 | 
| 3 | Many times | 582 | 
                                    
                                    48.5%
                                 | 
| 4 | Always | 330 | 
                                    
                                    27.5%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |