| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1.per day | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 2 | 2.per month | 301 | 
                                                                 
                                    
                                    16.8%
                                 
                                                             | 
                                                        
                    
| 3 | 3.per semester | 187 | 
                                                                 
                                    
                                    10.5%
                                 
                                                             | 
                                                        
                    
| 4 | 4.per academic year | 765 | 
                                                                 
                                    
                                    42.8%
                                 
                                                             | 
                                                        
                    
| 5 | 5. per study period | 524 | 
                                                                 
                                    
                                    29.3%
                                 
                                                             | 
                                                        
                    
| 8 | 8 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 9. Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1298 |