| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 19 | 
                                    
                                    3%
                                 | 
| 0 | 195 | 
                                    
                                    30.3%
                                 | |
| 1 | 79 | 
                                    
                                    12.3%
                                 | |
| 2 | 112 | 
                                    
                                    17.4%
                                 | |
| 3 | 54 | 
                                    
                                    8.4%
                                 | |
| 4 | 37 | 
                                    
                                    5.8%
                                 | |
| 5 | 51 | 
                                    
                                    7.9%
                                 | |
| 6 | 11 | 
                                    
                                    1.7%
                                 | |
| 7 | 7 | 
                                    
                                    1.1%
                                 | |
| 8 | 12 | 
                                    
                                    1.9%
                                 | |
| 9 | 4 | 
                                    
                                    0.6%
                                 | |
| 10 | 19 | 
                                    
                                    3%
                                 | |
| 11 | 2 | 
                                    
                                    0.3%
                                 | |
| 12 | 3 | 
                                    
                                    0.5%
                                 | |
| 13 | 2 | 
                                    
                                    0.3%
                                 | |
| 14 | 1 | 
                                    
                                    0.2%
                                 | |
| 15 | 11 | 
                                    
                                    1.7%
                                 | |
| 17 | 1 | 
                                    
                                    0.2%
                                 | |
| 20 | 4 | 
                                    
                                    0.6%
                                 | |
| 21 | 1 | 
                                    
                                    0.2%
                                 | |
| 22 | 1 | 
                                    
                                    0.2%
                                 | |
| 25 | 2 | 
                                    
                                    0.3%
                                 | |
| 26 | 1 | 
                                    
                                    0.2%
                                 | |
| 30 | 2 | 
                                    
                                    0.3%
                                 | |
| 32 | 1 | 
                                    
                                    0.2%
                                 | |
| 35 | 1 | 
                                    
                                    0.2%
                                 | |
| 40 | 2 | 
                                    
                                    0.3%
                                 | |
| 50 | 3 | 
                                    
                                    0.5%
                                 | |
| 70 | 1 | 
                                    
                                    0.2%
                                 | |
| 90 | 1 | 
                                    
                                    0.2%
                                 | |
| 100 | 2 | 
                                    
                                    0.3%
                                 | |
| 120 | 1 | 
                                    
                                    0.2%
                                 | |
| Sysmiss | 773 |