| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not on a regular basis | 126 | 
                                    
                                    6.4%
                                 | 
| 2 | Every few years | 342 | 
                                    
                                    17.4%
                                 | 
| 3 | Every year | 886 | 
                                    
                                    45%
                                 | 
| 4 | Every year with special topics | 0 | 
                                    
                                    0%
                                 | 
| 5 | Every semester | 485 | 
                                    
                                    24.7%
                                 | 
| 6 | Never had a visit | 128 | 
                                    
                                    6.5%
                                 |