| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 24 | 
                                    
                                    5.9%
                                 | 
| -7 | Does not apply (spontaneous) | 207 | 
                                    
                                    50.6%
                                 | 
| 0 | 63 | 
                                    
                                    15.4%
                                 | |
| 1 | 1 | 
                                    
                                    0.2%
                                 | |
| 3 | 1 | 
                                    
                                    0.2%
                                 | |
| 5 | 7 | 
                                    
                                    1.7%
                                 | |
| 6 | 1 | 
                                    
                                    0.2%
                                 | |
| 10 | 5 | 
                                    
                                    1.2%
                                 | |
| 12 | 1 | 
                                    
                                    0.2%
                                 | |
| 15 | 1 | 
                                    
                                    0.2%
                                 | |
| 20 | 3 | 
                                    
                                    0.7%
                                 | |
| 25 | 1 | 
                                    
                                    0.2%
                                 | |
| 30 | 2 | 
                                    
                                    0.5%
                                 | |
| 40 | 1 | 
                                    
                                    0.2%
                                 | |
| 50 | 4 | 
                                    
                                    1%
                                 | |
| 60 | 1 | 
                                    
                                    0.2%
                                 | |
| 70 | 3 | 
                                    
                                    0.7%
                                 | |
| 80 | 6 | 
                                    
                                    1.5%
                                 | |
| 83 | 1 | 
                                    
                                    0.2%
                                 | |
| 85 | 1 | 
                                    
                                    0.2%
                                 | |
| 88 | 1 | 
                                    
                                    0.2%
                                 | |
| 90 | 8 | 
                                    
                                    2%
                                 | |
| 96 | 1 | 
                                    
                                    0.2%
                                 | |
| 100 | 65 | 
                                    
                                    15.9%
                                 | |
| Sysmiss | 546 |