| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 75 | 
                                    
                                    6.3%
                                 | 
| 1 | Just once or twice | 72 | 
                                    
                                    6%
                                 | 
| 2 | Several times | 352 | 
                                    
                                    29.3%
                                 | 
| 3 | Many times | 588 | 
                                    
                                    49%
                                 | 
| 4 | Always | 112 | 
                                    
                                    9.3%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |