| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 536 | 
                                    
                                    44.7%
                                 | 
| 1 | Just once or twice | 100 | 
                                    
                                    8.3%
                                 | 
| 2 | Several times | 203 | 
                                    
                                    16.9%
                                 | 
| 3 | Many times | 222 | 
                                    
                                    18.5%
                                 | 
| 4 | Always | 138 | 
                                    
                                    11.5%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |