| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily or almost daily | 17 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 2 | Weekly | 14 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 3 | Monthly | 30 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 4 | Less than monthly | 152 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    
| 5 | Never | 3386 | 
                                                                 
                                    
                                    94.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1208 |