| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | Less than one day | 1 | 
                                    
                                    1.2%
                                 | 
| 1 | 9 | 
                                    
                                    11.1%
                                 | |
| 2 | 8 | 
                                    
                                    9.9%
                                 | |
| 3 | 9 | 
                                    
                                    11.1%
                                 | |
| 4 | 4 | 
                                    
                                    4.9%
                                 | |
| 5 | 6 | 
                                    
                                    7.4%
                                 | |
| 7 | 14 | 
                                    
                                    17.3%
                                 | |
| 8 | 1 | 
                                    
                                    1.2%
                                 | |
| 9 | 1 | 
                                    
                                    1.2%
                                 | |
| 10 | 1 | 
                                    
                                    1.2%
                                 | |
| 13 | 1 | 
                                    
                                    1.2%
                                 | |
| 14 | 12 | 
                                    
                                    14.8%
                                 | |
| 15 | 1 | 
                                    
                                    1.2%
                                 | |
| 16 | 2 | 
                                    
                                    2.5%
                                 | |
| 30 | 5 | 
                                    
                                    6.2%
                                 | |
| 37 | 1 | 
                                    
                                    1.2%
                                 | |
| 40 | 2 | 
                                    
                                    2.5%
                                 | |
| 45 | 1 | 
                                    
                                    1.2%
                                 | |
| 46 | 1 | 
                                    
                                    1.2%
                                 | |
| 75 | 1 | 
                                    
                                    1.2%
                                 | |
| Sysmiss | 282 |