| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 7 | 
                                    
                                    0%
                                 | 
| 0 | Never | 14613 | 
                                    
                                    60%
                                 | 
| 1 | Only once | 2043 | 
                                    
                                    8.4%
                                 | 
| 2 | A few times | 4065 | 
                                    
                                    16.7%
                                 | 
| 3 | Often | 3545 | 
                                    
                                    14.6%
                                 | 
| 9 | Don't know | 76 | 
                                    
                                    0.3%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 1048 |