| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 152 | 
                                    
                                    78.8%
                                 | |
| 1 | 8 | 
                                    
                                    4.1%
                                 | |
| 2 | 1 | 
                                    
                                    0.5%
                                 | |
| 3 | 1 | 
                                    
                                    0.5%
                                 | |
| 4 | 2 | 
                                    
                                    1%
                                 | |
| 5 | 5 | 
                                    
                                    2.6%
                                 | |
| 7 | 1 | 
                                    
                                    0.5%
                                 | |
| 10 | 8 | 
                                    
                                    4.1%
                                 | |
| 15 | 1 | 
                                    
                                    0.5%
                                 | |
| 19 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 2 | 
                                    
                                    1%
                                 | |
| 25 | 2 | 
                                    
                                    1%
                                 | |
| 30 | 1 | 
                                    
                                    0.5%
                                 | |
| 33 | 1 | 
                                    
                                    0.5%
                                 | |
| 50 | 3 | 
                                    
                                    1.6%
                                 | |
| 55 | 1 | 
                                    
                                    0.5%
                                 | |
| 80 | 1 | 
                                    
                                    0.5%
                                 | |
| 90 | 1 | 
                                    
                                    0.5%
                                 | |
| 100 | 1 | 
                                    
                                    0.5%
                                 | |
| Sysmiss | 49 |