| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily or almost daily | 3 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 2 | Weekly | 16 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 3 | Monthly | 21 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 4 | Less than monthly | 146 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    
| 5 | Never | 3848 | 
                                                                 
                                    
                                    95.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 976 |