| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1808 | 
                                    
                                    75.3%
                                 | 
| 1 | Just once or twice | 288 | 
                                    
                                    12%
                                 | 
| 2 | Several times | 206 | 
                                    
                                    8.6%
                                 | 
| 3 | Many times | 82 | 
                                    
                                    3.4%
                                 | 
| 4 | Always | 13 | 
                                    
                                    0.5%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 3 | 
                                    
                                    0.1%
                                 |