| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 998 | 
                                    
                                    83.2%
                                 | 
| 1 | Only once | 82 | 
                                    
                                    6.8%
                                 | 
| 2 | A few times | 92 | 
                                    
                                    7.7%
                                 | 
| 3 | Often | 27 | 
                                    
                                    2.3%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 | 
| 98 | Refused | 0 | 
                                    
                                    0%
                                 |