| Value | Category | Cases | |
|---|---|---|---|
| 1 | never | 64 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    
| 2 | once a month | 31 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| 3 | 2-3 times a month | 22 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 4 | once a week | 152 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    
| 5 | 2-6 times a week | 305 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    
| 6 | once a day | 2217 | 
                                                                 
                                    
                                    49.4%
                                 
                                                             | 
                                                        
                    
| 7 | at least twice a day | 1699 | 
                                                                 
                                    
                                    37.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 10 |