| Value | Category | 
|---|---|
| -9 | Missing | 
| -8 | Missing due to a mistake in CAPI enabling rule that was later fixed | 
| -7 | Missing due to late addition of question | 
| -6 | No record kept/Record not available/Attendance not taken | 
| -5 | Not available | 
| -4 | No response | 
| -3 | Not applicable | 
| -2 | Don't know | 
| -1 | Refused | 
| 1 | Yes | 
| 2 | No | 
| Sysmiss |