IPAQ data processing
IPAQ contains questions on vigorous activity, moderate activity, and walking. To calculate MET-min/week, conventional MET values (walking = 3.3, moderate activity = 4, vigorous activity = 8) were multiplied by minutes spent doing the activity and again by the number of days that activity was performed. For example, if a participant reported walking for 30 min seven days a week, the MET-min for that activity are: 3.3 × 30 × 7 = 693 MET-min/week. Total MET-min/week for all activities is obtained by adding together the MET-min achieved in each category. Remaining minutes in the week were rated at 1 MET.