| Value | Category | Cases | |
|---|---|---|---|
| 0 | never | 3301 | 
                                    
                                    35%
                                 | 
| 1 | once or twice | 3277 | 
                                    
                                    34.8%
                                 | 
| 2 | more often | 2848 | 
                                    
                                    30.2%
                                 | 
| Sysmiss | 5520 |