| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 times | 3228 | 
                                                                 
                                    
                                    88.1%
                                 
                                                             | 
                                                        
                    
| 2 | 1 or 2 times | 341 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    
| 3 | 3 to 9 times | 55 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    
| 4 | 10 or more times | 38 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 144 |