| Value | Category |
|---|---|
| -9 | Don't know |
| -8 | Refused |
| -5 | Not Applicable |
| -3 | Missing |
| 1 | Too Busy |
| 2 | Not Interested/Waste of time |
| 3 | Questionnaire too personal/too intrusive |
| 4 | Don't trust surveys |
| 5 | Never do surveys |
| 6 | Too old |
| 7 | Other (specify) |
| 8 | Imputed refusal |
| 9 | Not home/Unavailable |
| Sysmiss |