| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.5%
                                 | 
| 0 | 10 | 
                                    
                                    5.2%
                                 | |
| 1 | 8 | 
                                    
                                    4.2%
                                 | |
| 2 | 11 | 
                                    
                                    5.8%
                                 | |
| 3 | 12 | 
                                    
                                    6.3%
                                 | |
| 4 | 49 | 
                                    
                                    25.7%
                                 | |
| 5 | 1 | 
                                    
                                    0.5%
                                 | |
| 6 | 12 | 
                                    
                                    6.3%
                                 | |
| 8 | 37 | 
                                    
                                    19.4%
                                 | |
| 10 | 2 | 
                                    
                                    1%
                                 | |
| 12 | 19 | 
                                    
                                    9.9%
                                 | |
| 16 | 2 | 
                                    
                                    1%
                                 | |
| 20 | 1 | 
                                    
                                    0.5%
                                 | |
| 24 | 15 | 
                                    
                                    7.9%
                                 | |
| 29 | 1 | 
                                    
                                    0.5%
                                 | |
| 32 | 3 | 
                                    
                                    1.6%
                                 | |
| 36 | 2 | 
                                    
                                    1%
                                 | |
| 48 | 1 | 
                                    
                                    0.5%
                                 | |
| 52 | 3 | 
                                    
                                    1.6%
                                 | |
| 120 | 1 | 
                                    
                                    0.5%
                                 | |
| Sysmiss | 154 |