| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    3.4%
                                 | 
| -7 | Does not apply (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | Less than one day | 2 | 
                                    
                                    3.4%
                                 | 
| 2 | 3 | 
                                    
                                    5.2%
                                 | |
| 3 | 1 | 
                                    
                                    1.7%
                                 | |
| 5 | 13 | 
                                    
                                    22.4%
                                 | |
| 6 | 1 | 
                                    
                                    1.7%
                                 | |
| 7 | 8 | 
                                    
                                    13.8%
                                 | |
| 8 | 1 | 
                                    
                                    1.7%
                                 | |
| 9 | 1 | 
                                    
                                    1.7%
                                 | |
| 10 | 1 | 
                                    
                                    1.7%
                                 | |
| 14 | 10 | 
                                    
                                    17.2%
                                 | |
| 15 | 1 | 
                                    
                                    1.7%
                                 | |
| 20 | 3 | 
                                    
                                    5.2%
                                 | |
| 21 | 4 | 
                                    
                                    6.9%
                                 | |
| 28 | 1 | 
                                    
                                    1.7%
                                 | |
| 30 | 2 | 
                                    
                                    3.4%
                                 | |
| 42 | 1 | 
                                    
                                    1.7%
                                 | |
| 45 | 1 | 
                                    
                                    1.7%
                                 | |
| 60 | 1 | 
                                    
                                    1.7%
                                 | |
| 90 | 1 | 
                                    
                                    1.7%
                                 | |
| Sysmiss | 157 |