| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 2 | 1 | 
                                    
                                    1.5%
                                 | |
| 3 | 1 | 
                                    
                                    1.5%
                                 | |
| 4 | 1 | 
                                    
                                    1.5%
                                 | |
| 5 | 4 | 
                                    
                                    6.2%
                                 | |
| 10 | 12 | 
                                    
                                    18.5%
                                 | |
| 12 | 1 | 
                                    
                                    1.5%
                                 | |
| 14 | 1 | 
                                    
                                    1.5%
                                 | |
| 15 | 4 | 
                                    
                                    6.2%
                                 | |
| 20 | 13 | 
                                    
                                    20%
                                 | |
| 25 | 7 | 
                                    
                                    10.8%
                                 | |
| 30 | 6 | 
                                    
                                    9.2%
                                 | |
| 35 | 1 | 
                                    
                                    1.5%
                                 | |
| 40 | 6 | 
                                    
                                    9.2%
                                 | |
| 50 | 1 | 
                                    
                                    1.5%
                                 | |
| 70 | 1 | 
                                    
                                    1.5%
                                 | |
| 75 | 1 | 
                                    
                                    1.5%
                                 | |
| 80 | 3 | 
                                    
                                    4.6%
                                 | |
| 100 | 1 | 
                                    
                                    1.5%
                                 | |
| Sysmiss | 280 |