| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 850 | 
                                    
                                    70.8%
                                 | 
| 1 | Just once or twice | 176 | 
                                    
                                    14.7%
                                 | 
| 2 | Several times | 117 | 
                                    
                                    9.8%
                                 | 
| 3 | Many times | 44 | 
                                    
                                    3.7%
                                 | 
| 4 | Always | 13 | 
                                    
                                    1.1%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |