| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not in past 12 months | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 2 | Once | 15 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    
| 3 | Sometimes | 41 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    
| 4 | Often | 27 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1154 | 
                                                                 
                                    
                                    93.1%
                                 
                                                             | 
                                                        
                    |
| d | DK | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |