| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 1823 | 
                                    
                                    71.6%
                                 | 
| 1 | 413 | 
                                    
                                    16.2%
                                 | |
| 2 | 83 | 
                                    
                                    3.3%
                                 | |
| 3 | 45 | 
                                    
                                    1.8%
                                 | |
| 4 | 3 | 
                                    
                                    0.1%
                                 | |
| 5 | 1 | 
                                    
                                    0%
                                 | |
| 99 | Occional | 178 | 
                                    
                                    7%
                                 | 
| Sysmiss | 222 |