| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                    
                                    2%
                                 | 
| -7 | Does not apply (spontaneous) | 11 | 
                                    
                                    3.7%
                                 | 
| 0 | Less than one day | 9 | 
                                    
                                    3%
                                 | 
| 1 | 21 | 
                                    
                                    7%
                                 | |
| 2 | 37 | 
                                    
                                    12.4%
                                 | |
| 3 | 43 | 
                                    
                                    14.4%
                                 | |
| 4 | 13 | 
                                    
                                    4.4%
                                 | |
| 5 | 26 | 
                                    
                                    8.7%
                                 | |
| 6 | 2 | 
                                    
                                    0.7%
                                 | |
| 7 | 59 | 
                                    
                                    19.8%
                                 | |
| 8 | 1 | 
                                    
                                    0.3%
                                 | |
| 9 | 2 | 
                                    
                                    0.7%
                                 | |
| 10 | 16 | 
                                    
                                    5.4%
                                 | |
| 11 | 2 | 
                                    
                                    0.7%
                                 | |
| 12 | 1 | 
                                    
                                    0.3%
                                 | |
| 14 | 17 | 
                                    
                                    5.7%
                                 | |
| 15 | 2 | 
                                    
                                    0.7%
                                 | |
| 18 | 1 | 
                                    
                                    0.3%
                                 | |
| 20 | 1 | 
                                    
                                    0.3%
                                 | |
| 21 | 6 | 
                                    
                                    2%
                                 | |
| 25 | 1 | 
                                    
                                    0.3%
                                 | |
| 28 | 1 | 
                                    
                                    0.3%
                                 | |
| 30 | 6 | 
                                    
                                    2%
                                 | |
| 42 | 1 | 
                                    
                                    0.3%
                                 | |
| 44 | 1 | 
                                    
                                    0.3%
                                 | |
| 45 | 1 | 
                                    
                                    0.3%
                                 | |
| 48 | 1 | 
                                    
                                    0.3%
                                 | |
| 58 | 1 | 
                                    
                                    0.3%
                                 | |
| 60 | 3 | 
                                    
                                    1%
                                 | |
| 75 | 2 | 
                                    
                                    0.7%
                                 | |
| 85 | 1 | 
                                    
                                    0.3%
                                 | |
| 90 | 3 | 
                                    
                                    1%
                                 | |
| Sysmiss | 314 |