| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 16 | 1 | 
                                    
                                    25%
                                 | |
| 19 | 1 | 
                                    
                                    25%
                                 | |
| 35 | 1 | 
                                    
                                    25%
                                 | |
| 62 | 1 | 
                                    
                                    25%
                                 | |
| Sysmiss | 360 |