| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 29 | 
                                    
                                    0.1%
                                 | 
| 0 | Never | 7610 | 
                                    
                                    30%
                                 | 
| 1 | Occasionally | 11680 | 
                                    
                                    46%
                                 | 
| 2 | Frequently | 5795 | 
                                    
                                    22.8%
                                 | 
| 9 | Don't know | 283 | 
                                    
                                    1.1%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |