Physical Activity (3 items): Respondents rated the items “On how many of the past 7 days did you participate in vigorous exercise for at least 20 minutes?”; “On how many of the past 7 days did you participate in moderate exercise for at least 30 minutes?”; and, “On how many of the past 7 days did you do exercises to strengthen or tone muscles (push-ups, sit-ups, or weight lifting)?”. The response scales for each of the three items were the number of days, ranging from 1 to 7 days.