| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 612 | 
                                    
                                    51%
                                 | 
| 1 | Just once or twice | 158 | 
                                    
                                    13.2%
                                 | 
| 2 | Several times | 153 | 
                                    
                                    12.8%
                                 | 
| 3 | Many times | 175 | 
                                    
                                    14.6%
                                 | 
| 4 | Always | 102 | 
                                    
                                    8.5%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |