| Value | Category |
|---|---|
| -9 | refused to answer |
| -8 | don't know |
| 1 | never |
| 2 | less than once a month |
| 3 | a few times per month |
| 4 | once a week |
| 5 | more than once a week |
| 2147483622 | .a Not asked |
| 2147483623 | .b Do not know |
| 2147483624 | .c Declined to answer |
| 2147483625 | Incorrect error code |
| 2147483626 | .e Aus |
| 11 | .B |