| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 4 | 1 | 
                                    
                                    1.4%
                                 | |
| 6 | 1 | 
                                    
                                    1.4%
                                 | |
| 20 | 1 | 
                                    
                                    1.4%
                                 | |
| 24 | 3 | 
                                    
                                    4.1%
                                 | |
| 34 | 1 | 
                                    
                                    1.4%
                                 | |
| 36 | 1 | 
                                    
                                    1.4%
                                 | |
| 48 | 1 | 
                                    
                                    1.4%
                                 | |
| 50 | 2 | 
                                    
                                    2.7%
                                 | |
| 80 | 2 | 
                                    
                                    2.7%
                                 | |
| 96 | 1 | 
                                    
                                    1.4%
                                 | |
| 98 | 1 | 
                                    
                                    1.4%
                                 | |
| 100 | 3 | 
                                    
                                    4.1%
                                 | |
| 120 | 3 | 
                                    
                                    4.1%
                                 | |
| 140 | 1 | 
                                    
                                    1.4%
                                 | |
| 168 | 1 | 
                                    
                                    1.4%
                                 | |
| 200 | 4 | 
                                    
                                    5.5%
                                 | |
| 240 | 5 | 
                                    
                                    6.8%
                                 | |
| 288 | 1 | 
                                    
                                    1.4%
                                 | |
| 300 | 2 | 
                                    
                                    2.7%
                                 | |
| 365 | 1 | 
                                    
                                    1.4%
                                 | |
| 480 | 1 | 
                                    
                                    1.4%
                                 | |
| 600 | 2 | 
                                    
                                    2.7%
                                 | |
| 720 | 2 | 
                                    
                                    2.7%
                                 | |
| 840 | 4 | 
                                    
                                    5.5%
                                 | |
| 960 | 1 | 
                                    
                                    1.4%
                                 | |
| 1000 | 2 | 
                                    
                                    2.7%
                                 | |
| 1200 | 9 | 
                                    
                                    12.3%
                                 | |
| 1440 | 1 | 
                                    
                                    1.4%
                                 | |
| 1800 | 1 | 
                                    
                                    1.4%
                                 | |
| 2000 | 1 | 
                                    
                                    1.4%
                                 | |
| 2160 | 1 | 
                                    
                                    1.4%
                                 | |
| 2400 | 2 | 
                                    
                                    2.7%
                                 | |
| 3200 | 1 | 
                                    
                                    1.4%
                                 | |
| 3600 | 1 | 
                                    
                                    1.4%
                                 | |
| 4000 | 1 | 
                                    
                                    1.4%
                                 | |
| 6240 | 1 | 
                                    
                                    1.4%
                                 | |
| 8400 | 1 | 
                                    
                                    1.4%
                                 | |
| 9000 | 1 | 
                                    
                                    1.4%
                                 | |
| 720000 | 1 | 
                                    
                                    1.4%
                                 | |
| 1200000 | 1 | 
                                    
                                    1.4%
                                 | |
| 1320000 | 1 | 
                                    
                                    1.4%
                                 | |
| 2400000 | 1 | 
                                    
                                    1.4%
                                 | |
| Sysmiss | 539 |