| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily or almost daily | 8 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 2 | Weekly | 26 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 3 | Monthly | 54 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 4 | Less than monthly | 180 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    
| 5 | Never | 3766 | 
                                                                 
                                    
                                    93.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 976 |