| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 13 | 
                                    
                                    40.6%
                                 | |
| 1 | One minute or less | 1 | 
                                    
                                    3.1%
                                 | 
| 3 | 1 | 
                                    
                                    3.1%
                                 | |
| 10 | 3 | 
                                    
                                    9.4%
                                 | |
| 15 | 3 | 
                                    
                                    9.4%
                                 | |
| 20 | 1 | 
                                    
                                    3.1%
                                 | |
| 30 | 4 | 
                                    
                                    12.5%
                                 | |
| 40 | 1 | 
                                    
                                    3.1%
                                 | |
| 50 | 4 | 
                                    
                                    12.5%
                                 | |
| 55 | 1 | 
                                    
                                    3.1%
                                 | |
| Sysmiss | 370 |