| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 2 | 1 | 
                                    
                                    0.8%
                                 | |
| 3 | 1 | 
                                    
                                    0.8%
                                 | |
| 4 | 1 | 
                                    
                                    0.8%
                                 | |
| 5 | 15 | 
                                    
                                    12.5%
                                 | |
| 6 | 1 | 
                                    
                                    0.8%
                                 | |
| 7 | 2 | 
                                    
                                    1.7%
                                 | |
| 8 | 6 | 
                                    
                                    5%
                                 | |
| 10 | 16 | 
                                    
                                    13.3%
                                 | |
| 11 | 1 | 
                                    
                                    0.8%
                                 | |
| 12 | 1 | 
                                    
                                    0.8%
                                 | |
| 15 | 12 | 
                                    
                                    10%
                                 | |
| 16 | 1 | 
                                    
                                    0.8%
                                 | |
| 20 | 12 | 
                                    
                                    10%
                                 | |
| 25 | 2 | 
                                    
                                    1.7%
                                 | |
| 30 | 13 | 
                                    
                                    10.8%
                                 | |
| 35 | 1 | 
                                    
                                    0.8%
                                 | |
| 40 | 1 | 
                                    
                                    0.8%
                                 | |
| 50 | 14 | 
                                    
                                    11.7%
                                 | |
| 60 | 4 | 
                                    
                                    3.3%
                                 | |
| 65 | 1 | 
                                    
                                    0.8%
                                 | |
| 75 | 1 | 
                                    
                                    0.8%
                                 | |
| 80 | 6 | 
                                    
                                    5%
                                 | |
| 100 | 6 | 
                                    
                                    5%
                                 | |
| 150 | 1 | 
                                    
                                    0.8%
                                 | |
| Sysmiss | 225 |