| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 2 | 2 | 
                                    
                                    0.6%
                                 | |
| 3 | 3 | 
                                    
                                    1%
                                 | |
| 4 | 1 | 
                                    
                                    0.3%
                                 | |
| 5 | 7 | 
                                    
                                    2.2%
                                 | |
| 10 | 26 | 
                                    
                                    8.3%
                                 | |
| 12 | 1 | 
                                    
                                    0.3%
                                 | |
| 15 | 5 | 
                                    
                                    1.6%
                                 | |
| 20 | 30 | 
                                    
                                    9.5%
                                 | |
| 25 | 6 | 
                                    
                                    1.9%
                                 | |
| 30 | 28 | 
                                    
                                    8.9%
                                 | |
| 32 | 1 | 
                                    
                                    0.3%
                                 | |
| 35 | 5 | 
                                    
                                    1.6%
                                 | |
| 40 | 24 | 
                                    
                                    7.6%
                                 | |
| 43 | 1 | 
                                    
                                    0.3%
                                 | |
| 45 | 4 | 
                                    
                                    1.3%
                                 | |
| 48 | 1 | 
                                    
                                    0.3%
                                 | |
| 50 | 103 | 
                                    
                                    32.7%
                                 | |
| 60 | 21 | 
                                    
                                    6.7%
                                 | |
| 65 | 1 | 
                                    
                                    0.3%
                                 | |
| 70 | 8 | 
                                    
                                    2.5%
                                 | |
| 72 | 1 | 
                                    
                                    0.3%
                                 | |
| 75 | 10 | 
                                    
                                    3.2%
                                 | |
| 80 | 9 | 
                                    
                                    2.9%
                                 | |
| 90 | 7 | 
                                    
                                    2.2%
                                 | |
| 99 | 1 | 
                                    
                                    0.3%
                                 | |
| 100 | 9 | 
                                    
                                    2.9%
                                 | |
| Sysmiss | 297 |