| Value | Category | Cases | |
|---|---|---|---|
| 1 | once | 3276 | 
                                                                 
                                    
                                    42.8%
                                 
                                                             | 
                                                        
                    
| 2 | twice | 1039 | 
                                                                 
                                    
                                    13.6%
                                 
                                                             | 
                                                        
                    
| 3 | three or more | 643 | 
                                                                 
                                    
                                    8.4%
                                 
                                                             | 
                                                        
                    
| 4 | does not apply | 458 | 
                                                                 
                                    
                                    6%
                                 
                                                             | 
                                                        
                    
| 5 | none | 2231 | 
                                                                 
                                    
                                    29.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 41539 |