| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.5%
                                 | 
| 0 | 13 | 
                                    
                                    6.1%
                                 | |
| 1 | 40 | 
                                    
                                    18.8%
                                 | |
| 2 | 33 | 
                                    
                                    15.5%
                                 | |
| 3 | 24 | 
                                    
                                    11.3%
                                 | |
| 4 | 19 | 
                                    
                                    8.9%
                                 | |
| 5 | 18 | 
                                    
                                    8.5%
                                 | |
| 6 | 16 | 
                                    
                                    7.5%
                                 | |
| 7 | 11 | 
                                    
                                    5.2%
                                 | |
| 8 | 1 | 
                                    
                                    0.5%
                                 | |
| 9 | 4 | 
                                    
                                    1.9%
                                 | |
| 10 | 4 | 
                                    
                                    1.9%
                                 | |
| 11 | 2 | 
                                    
                                    0.9%
                                 | |
| 12 | 4 | 
                                    
                                    1.9%
                                 | |
| 14 | 2 | 
                                    
                                    0.9%
                                 | |
| 15 | 3 | 
                                    
                                    1.4%
                                 | |
| 17 | 2 | 
                                    
                                    0.9%
                                 | |
| 18 | 2 | 
                                    
                                    0.9%
                                 | |
| 19 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 1 | 
                                    
                                    0.5%
                                 | |
| 23 | 1 | 
                                    
                                    0.5%
                                 | |
| 24 | 1 | 
                                    
                                    0.5%
                                 | |
| 28 | 1 | 
                                    
                                    0.5%
                                 | |
| 30 | 1 | 
                                    
                                    0.5%
                                 | |
| 32 | 1 | 
                                    
                                    0.5%
                                 | |
| 35 | 1 | 
                                    
                                    0.5%
                                 | |
| 40 | 2 | 
                                    
                                    0.9%
                                 | |
| 43 | 1 | 
                                    
                                    0.5%
                                 | |
| 58 | 1 | 
                                    
                                    0.5%
                                 | |
| 63 | 1 | 
                                    
                                    0.5%
                                 | |
| 426 | 1 | 
                                    
                                    0.5%
                                 | |
| Sysmiss | 150 |