| Value | Category | Cases | |
|---|---|---|---|
| 1 | YES, WITHIN 24 HOURS | 14 | 
                                    
                                    0.9%
                                 | 
| 2 | YES, BUT NOT WITHIN 24 HOURS | 3 | 
                                    
                                    0.2%
                                 | 
| 8 | DK | 7 | 
                                    
                                    0.4%
                                 | 
| 9 | NO RESPONSE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 1538 | 
                                    
                                    98.3%
                                 |