| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | Less than one day | 0 | 
                                    
                                    0%
                                 | 
| 3 | 3 | 
                                    
                                    9.4%
                                 | |
| 4 | 6 | 
                                    
                                    18.8%
                                 | |
| 5 | 14 | 
                                    
                                    43.8%
                                 | |
| 6 | 4 | 
                                    
                                    12.5%
                                 | |
| 7 | 2 | 
                                    
                                    6.3%
                                 | |
| 10 | 1 | 
                                    
                                    3.1%
                                 | |
| 15 | 2 | 
                                    
                                    6.3%
                                 | |
| Sysmiss | 966 |