| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 384 | 
                                    
                                    32%
                                 | 
| 1 | Just once or twice | 105 | 
                                    
                                    8.8%
                                 | 
| 2 | Several times | 252 | 
                                    
                                    21%
                                 | 
| 3 | Many times | 279 | 
                                    
                                    23.3%
                                 | 
| 4 | Always | 180 | 
                                    
                                    15%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |