| Value | Category | Cases | |
|---|---|---|---|
| -2 | don't know | 1 | 
                                    
                                    0.4%
                                 | 
| -1 | refuse | 0 | 
                                    
                                    0%
                                 | 
| 1 | 0-8 hour | 1 | 
                                    
                                    0.4%
                                 | 
| 2 | 9-16 hours | 2 | 
                                    
                                    0.8%
                                 | 
| 3 | 17-24 hours | 258 | 
                                    
                                    98.5%
                                 | 
| Sysmiss | 787 |