| Value | Category |
|---|---|
| 1 | hhmemid #1 |
| 2 | hhmemid #2 |
| 3 | hhmemid #3 |
| 4 | hhmemid #4 |
| 5 | hhmemid #5 |
| 6 | hhmemid #6 |
| 7 | hhmemid #7 |
| 8 | hhmemid #8 |
| a | Don't know |
| b | Refused to answer |
| c | Outlier set to missing |
| d | Dropped during anonymization (available on request) |
| e | Skipped in error |
| z | Not applicable |