| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 335 | 
                                    
                                    27.9%
                                 | 
| 1 | Just once or twice | 115 | 
                                    
                                    9.6%
                                 | 
| 2 | Several times | 337 | 
                                    
                                    28.1%
                                 | 
| 3 | Many times | 297 | 
                                    
                                    24.8%
                                 | 
| 4 | Always | 114 | 
                                    
                                    9.5%
                                 | 
| 8 | Refused | 1 | 
                                    
                                    0.1%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |