Table 1 A four-category scale for assessment of self-reported physical activity during the last month

Sedentary

You spend most of your time sedentary. You walk or are active in some other way for less than 2 hours per week.

Moderate activity

You walk or are active in some other way for at least 2 hours per week, usually without sweating.

Moderate regular exercise

You exercise regularly 1–2 times per week, at least 30 minutes per time, with activity that causes you to sweat.

Regular activity and exercise

You exercise regularly at least 3 times per week, at least 30 minutes per time, with activity that causes you to sweat.