| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 36 | 
                                    
                                    13.7%
                                 | 
| 0 | Less than one day | 11 | 
                                    
                                    4.2%
                                 | 
| 1 | 11 | 
                                    
                                    4.2%
                                 | |
| 2 | 16 | 
                                    
                                    6.1%
                                 | |
| 3 | 29 | 
                                    
                                    11.1%
                                 | |
| 4 | 7 | 
                                    
                                    2.7%
                                 | |
| 5 | 17 | 
                                    
                                    6.5%
                                 | |
| 6 | 6 | 
                                    
                                    2.3%
                                 | |
| 7 | 35 | 
                                    
                                    13.4%
                                 | |
| 8 | 2 | 
                                    
                                    0.8%
                                 | |
| 9 | 6 | 
                                    
                                    2.3%
                                 | |
| 10 | 19 | 
                                    
                                    7.3%
                                 | |
| 11 | 2 | 
                                    
                                    0.8%
                                 | |
| 13 | 2 | 
                                    
                                    0.8%
                                 | |
| 14 | 19 | 
                                    
                                    7.3%
                                 | |
| 15 | 2 | 
                                    
                                    0.8%
                                 | |
| 18 | 2 | 
                                    
                                    0.8%
                                 | |
| 20 | 1 | 
                                    
                                    0.4%
                                 | |
| 21 | 1 | 
                                    
                                    0.4%
                                 | |
| 24 | 2 | 
                                    
                                    0.8%
                                 | |
| 25 | 1 | 
                                    
                                    0.4%
                                 | |
| 30 | 7 | 
                                    
                                    2.7%
                                 | |
| 31 | 1 | 
                                    
                                    0.4%
                                 | |
| 35 | 2 | 
                                    
                                    0.8%
                                 | |
| 37 | 3 | 
                                    
                                    1.1%
                                 | |
| 42 | 2 | 
                                    
                                    0.8%
                                 | |
| 45 | 4 | 
                                    
                                    1.5%
                                 | |
| 50 | 2 | 
                                    
                                    0.8%
                                 | |
| 52 | 1 | 
                                    
                                    0.4%
                                 | |
| 60 | 4 | 
                                    
                                    1.5%
                                 | |
| 63 | 3 | 
                                    
                                    1.1%
                                 | |
| 67 | 1 | 
                                    
                                    0.4%
                                 | |
| 70 | 1 | 
                                    
                                    0.4%
                                 | |
| 80 | 1 | 
                                    
                                    0.4%
                                 | |
| 85 | 1 | 
                                    
                                    0.4%
                                 | |
| 93 | 1 | 
                                    
                                    0.4%
                                 | |
| 105 | 1 | 
                                    
                                    0.4%
                                 | |
| Sysmiss | 350 |