Table 1. Potential correlates of objectively measured thinness or overweight/obesity.

Variable	Method of measurement	Use in analysis
Individual characteristics
Sex	Parent-reported	Binary variable: male or female (covariate)
Age	Parent-reported	Continuous (covariate)
School commute (mode of transport to and from school for main part of the journey)	Participant-reported	Re-coded as a dichotomous variable: active (walking, bicycle/rollerblade/skateboard/scooter), or passive (bus/train/ boat, car/motorcycle/moped)
Total sedentary time	Accelerometer measured	Continuous
Light-intensity physical activity	Accelerometer measured	Continuous
Moderate-to-vigorous-intensity physical activity	Accelerometer measured	Continuous: re-coded as dichotomous (< 60 minutes per day) or (≥60 minutes per day)
Sleep duration	Accelerometer measured	Continuous
Recreational screen time	Participant-reported	Continuous
Outdoor play time (before school, after school, weekend)	Participant-reported	Continuous
Recreational screen time	Participant-reported	Dichotomous: (≤ 2 hours of recreational screen time) or (> 2 hours of recreational screen time) per day
Participation in sports	Participant-reported	Dichotomous: (Did not participate in sporting activities) or (participated in sporting activities) in the past year
Health-related quality of life	Participant-reported	Dichotomous: (poor, fair) or (good, very good, excellent)
Consumption of breakfast	Participant-reported	Dichotomous: (eats breakfast ≤ 6 days per week) or (eats breakfast daily)
Consumption of fruits	Participant-reported	Dichotomous: (eats fruits ≤ 3 days per week) or (eats fruits 4 or more days per week)
Consumption of vegetables	Participant-reported	Dichotomous: (eats vegetables ≤ 3 days per week) or (eats vegetables 4 or more days per week)
Consumption of fast-food	Participant-reported	Dichotomous: (eats fast food ≤ 3 times per week) or (eats fast food > 3 times per week)
Consumption of fried food	Participant-reported	Dichotomous: (eats fried food ≤ 3 times per week) or (eats fried food > 3 times per week)
Consumption of fries	Participant-reported	Dichotomous: (eats fries ≤ 3 times per week) or (eats fries > 3 times per week)
Consumption of fast food while watching television	Participant-reported	Dichotomous (Does not eat fast food while watching television) or (eats fast food while watching television at least once per week)
Characteristics of participant’s parents/legal guardians
Mother’s BMI	Parent-reported	Continuous: re-coded as dichotomous <25 or ≥25 kg/m2
Father’s BMI	Parent-reported	Continuous: re-coded as dichotomous <25 or ≥25 kg/m2
Parental level of education	Parent-reported	Re-coded as highest level of parental education (covariate): <high school, high school/some college, or bachelor’s/graduate degree
Mother’s work status	Parent-reported	Continuous: re-coded as dichotomous (≤15 hours/week) or (>15 hours/week)
Father’s work status	Parent-reported	Continuous: recoded as dichotomous (≤15 hours/week) or (>15 hours/week)
Home Environment
Number of televisions in the house	Parent-reported	Re-coded as categorical: 0 or 1 or ≥2
Number of functional cars at home	Parent-reported	Re-coded as categorical: 0 or 1 or ≥2
Number of siblings for participant	Parent-reported	Continuous: recoded as dichotomous ≤2 or ≥3
Number of residents at home	Parent-reported	Continuous: recoded as dichotomous; ≤3 or≥4
Neighborhood Environment
High crime rate in the neighbourhood	Parent-reported	Re-coded as binary: “disagreed/strongly disagreed”, and “agreed/strongly agreed”
Trust people in the community	Parent-reported	Re-coded as binary: “disagreed/strongly disagreed”, and “agreed/strongly agreed”
School Environment
School location	School-Administrator-reported	Binary: urban or rural
Physical activity policies	School-Administrator-reported	Binary: yes/no
Healthy eating policies	School-Administrator-reported	Binary: yes/no

BMI: Body Mass Index