| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1819 | 
                                    
                                    75.8%
                                 | 
| 1 | Just once or twice | 258 | 
                                    
                                    10.8%
                                 | 
| 2 | Several times | 179 | 
                                    
                                    7.5%
                                 | 
| 3 | Many times | 70 | 
                                    
                                    2.9%
                                 | 
| 4 | Always | 68 | 
                                    
                                    2.8%
                                 | 
| 8 | Refused | 1 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 5 | 
                                    
                                    0.2%
                                 |