| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    0.8%
                                 | 
| 0 | 1 | 
                                    
                                    0.4%
                                 | |
| 1 | 1-2 indicators | 60 | 
                                    
                                    22.8%
                                 | 
| 2 | 3-9 indicators | 156 | 
                                    
                                    59.3%
                                 | 
| 3 | 10 or more indicators | 44 | 
                                    
                                    16.7%
                                 | 
| Sysmiss | 692 |