| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| -7 | Does not apply | 0 | 
                                    
                                    0%
                                 | 
| 1 | One day or less | 6 | 
                                    
                                    33.3%
                                 | 
| 3 | 4 | 
                                    
                                    22.2%
                                 | |
| 5 | 2 | 
                                    
                                    11.1%
                                 | |
| 20 | 2 | 
                                    
                                    11.1%
                                 | |
| 28 | 1 | 
                                    
                                    5.6%
                                 | |
| 30 | 2 | 
                                    
                                    11.1%
                                 | |
| 40 | 1 | 
                                    
                                    5.6%
                                 | |
| Sysmiss | 232 |