The subjects are all part of the on-going Fragile Families and Child Wellbeing Study, who have been followed since a baseline survey conducted with mothers and fathers soon after the child's birth (19
*Total PA—all 4 domains of physical activity; at least 150 minutes/week of moderate-to-vigorous physical activity. ** LTPA—Leisure-time physical activity; at least 150 minutes/week of moderate-to-vigo
