| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 27 | 
                                    
                                    7.4%
                                 | 
| -8 | 2 | 
                                    
                                    0.6%
                                 | |
| -7 | Does not apply | 81 | 
                                    
                                    22.3%
                                 | 
| 1 | One day or less | 124 | 
                                    
                                    34.2%
                                 | 
| 2 | 46 | 
                                    
                                    12.7%
                                 | |
| 3 | 24 | 
                                    
                                    6.6%
                                 | |
| 4 | 4 | 
                                    
                                    1.1%
                                 | |
| 5 | 10 | 
                                    
                                    2.8%
                                 | |
| 7 | 10 | 
                                    
                                    2.8%
                                 | |
| 9 | 1 | 
                                    
                                    0.3%
                                 | |
| 10 | 5 | 
                                    
                                    1.4%
                                 | |
| 12 | 1 | 
                                    
                                    0.3%
                                 | |
| 14 | 2 | 
                                    
                                    0.6%
                                 | |
| 15 | 3 | 
                                    
                                    0.8%
                                 | |
| 20 | 1 | 
                                    
                                    0.3%
                                 | |
| 21 | 5 | 
                                    
                                    1.4%
                                 | |
| 30 | 12 | 
                                    
                                    3.3%
                                 | |
| 35 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 2 | 
                                    
                                    0.6%
                                 | |
| 50 | 1 | 
                                    
                                    0.3%
                                 | |
| 100 | 1 | 
                                    
                                    0.3%
                                 | |
| Sysmiss | 592 |