| Value | Category |
|---|---|
| 1 | Every month or more often |
| 2 | Less than every moth – every quarter |
| 3 | Less often than every quarter – every 6 months |
| 4 | Less often than every 6 months – every year |
| 5 | Less often than every year |
| 6 | Other,specify |
| 7 | Don’t know |
| 8 | Not applicable |
| 9 | Unspecified |