| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    2.5%
                                 | 
| 0 | 34 | 
                                    
                                    21.4%
                                 | |
| 1 | One minute or less | 23 | 
                                    
                                    14.5%
                                 | 
| 5 | 1 | 
                                    
                                    0.6%
                                 | |
| 10 | 4 | 
                                    
                                    2.5%
                                 | |
| 15 | 22 | 
                                    
                                    13.8%
                                 | |
| 20 | 10 | 
                                    
                                    6.3%
                                 | |
| 25 | 4 | 
                                    
                                    2.5%
                                 | |
| 30 | 30 | 
                                    
                                    18.9%
                                 | |
| 35 | 3 | 
                                    
                                    1.9%
                                 | |
| 40 | 6 | 
                                    
                                    3.8%
                                 | |
| 45 | 15 | 
                                    
                                    9.4%
                                 | |
| 50 | 3 | 
                                    
                                    1.9%
                                 | |
| Sysmiss | 56 |