| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    3.4%
                                 | 
| 0 | Less than one day | 0 | 
                                    
                                    0%
                                 | 
| 1 | 2 | 
                                    
                                    1.7%
                                 | |
| 2 | 5 | 
                                    
                                    4.3%
                                 | |
| 3 | 4 | 
                                    
                                    3.4%
                                 | |
| 4 | 3 | 
                                    
                                    2.6%
                                 | |
| 5 | 3 | 
                                    
                                    2.6%
                                 | |
| 6 | 1 | 
                                    
                                    0.9%
                                 | |
| 7 | 1 | 
                                    
                                    0.9%
                                 | |
| 8 | 1 | 
                                    
                                    0.9%
                                 | |
| 10 | 7 | 
                                    
                                    6%
                                 | |
| 12 | 1 | 
                                    
                                    0.9%
                                 | |
| 13 | 3 | 
                                    
                                    2.6%
                                 | |
| 14 | 12 | 
                                    
                                    10.3%
                                 | |
| 15 | 7 | 
                                    
                                    6%
                                 | |
| 16 | 3 | 
                                    
                                    2.6%
                                 | |
| 17 | 4 | 
                                    
                                    3.4%
                                 | |
| 18 | 3 | 
                                    
                                    2.6%
                                 | |
| 20 | 7 | 
                                    
                                    6%
                                 | |
| 21 | 4 | 
                                    
                                    3.4%
                                 | |
| 22 | 2 | 
                                    
                                    1.7%
                                 | |
| 23 | 2 | 
                                    
                                    1.7%
                                 | |
| 25 | 3 | 
                                    
                                    2.6%
                                 | |
| 26 | 1 | 
                                    
                                    0.9%
                                 | |
| 27 | 1 | 
                                    
                                    0.9%
                                 | |
| 29 | 1 | 
                                    
                                    0.9%
                                 | |
| 30 | 10 | 
                                    
                                    8.5%
                                 | |
| 33 | 1 | 
                                    
                                    0.9%
                                 | |
| 34 | 1 | 
                                    
                                    0.9%
                                 | |
| 37 | 1 | 
                                    
                                    0.9%
                                 | |
| 38 | 1 | 
                                    
                                    0.9%
                                 | |
| 40 | 3 | 
                                    
                                    2.6%
                                 | |
| 45 | 5 | 
                                    
                                    4.3%
                                 | |
| 48 | 1 | 
                                    
                                    0.9%
                                 | |
| 50 | 1 | 
                                    
                                    0.9%
                                 | |
| 54 | 1 | 
                                    
                                    0.9%
                                 | |
| 60 | 3 | 
                                    
                                    2.6%
                                 | |
| 63 | 1 | 
                                    
                                    0.9%
                                 | |
| 90 | 3 | 
                                    
                                    2.6%
                                 | |
| Sysmiss | 194 |