| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONCE | 943 | 
                                    
                                    87.6%
                                 | 
| 2 | MORE THAN ONCE | 134 | 
                                    
                                    12.4%
                                 | 
| 9 | NO RESPONSE | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 29983 |