| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| -7 | Does not apply (spontaneous) | 3 | 
                                    
                                    3.6%
                                 | 
| 0 | Less than one day | 4 | 
                                    
                                    4.8%
                                 | 
| 1 | 18 | 
                                    
                                    21.4%
                                 | |
| 2 | 13 | 
                                    
                                    15.5%
                                 | |
| 3 | 17 | 
                                    
                                    20.2%
                                 | |
| 4 | 2 | 
                                    
                                    2.4%
                                 | |
| 5 | 2 | 
                                    
                                    2.4%
                                 | |
| 7 | 12 | 
                                    
                                    14.3%
                                 | |
| 10 | 2 | 
                                    
                                    2.4%
                                 | |
| 14 | 1 | 
                                    
                                    1.2%
                                 | |
| 15 | 3 | 
                                    
                                    3.6%
                                 | |
| 20 | 1 | 
                                    
                                    1.2%
                                 | |
| 28 | 1 | 
                                    
                                    1.2%
                                 | |
| 30 | 3 | 
                                    
                                    3.6%
                                 | |
| 45 | 1 | 
                                    
                                    1.2%
                                 | |
| 75 | 1 | 
                                    
                                    1.2%
                                 | |
| Sysmiss | 279 |