| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Never | 1144 | 
                                    
                                    95.3%
                                 | 
| 1 | Once or twice | 34 | 
                                    
                                    2.8%
                                 | 
| 2 | Several times | 17 | 
                                    
                                    1.4%
                                 | 
| 3 | Many times | 5 | 
                                    
                                    0.4%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |