| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    2.2%
                                 | 
| -7 | Does not apply (spontaneous) | 33 | 
                                    
                                    24.1%
                                 | 
| 0 | Less than one day | 17 | 
                                    
                                    12.4%
                                 | 
| 1 | 21 | 
                                    
                                    15.3%
                                 | |
| 2 | 19 | 
                                    
                                    13.9%
                                 | |
| 3 | 13 | 
                                    
                                    9.5%
                                 | |
| 4 | 4 | 
                                    
                                    2.9%
                                 | |
| 5 | 3 | 
                                    
                                    2.2%
                                 | |
| 7 | 1 | 
                                    
                                    0.7%
                                 | |
| 8 | 1 | 
                                    
                                    0.7%
                                 | |
| 10 | 3 | 
                                    
                                    2.2%
                                 | |
| 13 | 1 | 
                                    
                                    0.7%
                                 | |
| 14 | 7 | 
                                    
                                    5.1%
                                 | |
| 15 | 1 | 
                                    
                                    0.7%
                                 | |
| 20 | 2 | 
                                    
                                    1.5%
                                 | |
| 21 | 1 | 
                                    
                                    0.7%
                                 | |
| 28 | 2 | 
                                    
                                    1.5%
                                 | |
| 30 | 3 | 
                                    
                                    2.2%
                                 | |
| 60 | 2 | 
                                    
                                    1.5%
                                 | |
| Sysmiss | 265 |