| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 10 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    
| 1 | 1 year | 6 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 2 | 2 years | 1 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| 3 | 3 years | 9 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    
| 4 | 4 years | 6 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 5 | 5 years | 9 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    
| 6 | 6+ years | 6 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 7 | non-numeric | 33 | 
                                                                 
                                    
                                    34.4%
                                 
                                                             | 
                                                        
                    
| 8 | don't know | 16 | 
                                                                 
                                    
                                    16.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 116 |