| Value | Category |
|---|---|
| 1 or 2 days in the past year | |
| 2 to 3 days a month, on average | |
| 3 to 11 days in the past year | |
| 3 to 4 days a week | |
| 5 to 6 days a week | |
| every day | |
| never in the past year | |
| one day a month, on average | |
| one day a week, on average | |
| two days a week, on average |