| Value | Category |
|---|---|
| 1 | most of the day |
| 2 | couple times a day |
| 3 | once a day |
| 4 | at least once a week |
| 5 | at least once a month |
| 6 | less than once a month |
| 7 | never |
| 98 | don't know |
| Missing value |
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