| Value | Category | Cases | |
|---|---|---|---|
| 1 | Now | 2 | 
                                
                                0%
                             | 
| 2 | Later | 14 | 
                                
                                0.3%
                             | 
| 3 | Not at all | 3 | 
                                
                                0.1%
                             | 
| 5 | Missing | 2 | 
                                
                                0%
                             | 
| 7 | Refusal | 3 | 
                                
                                0.1%
                             | 
| 9 | Not applicable | 5101 | 
                                
                                99.5%
                             | 
| Sysmiss | 269 |