| Value | Category | Cases | |
|---|---|---|---|
| 1 | Now | 9 | 
                                
                                0.2%
                             | 
| 2 | Later | 27 | 
                                
                                0.6%
                             | 
| 3 | Not at all | 1 | 
                                
                                0%
                             | 
| 5 | Missing | 23 | 
                                
                                0.5%
                             | 
| 7 | Refusal | 0 | 
                                
                                0%
                             | 
| 9 | Not applicable | 4279 | 
                                
                                98.6%
                             | 
| Sysmiss | 1 |