Table 2 Potential correlates of meeting the combined movement guidelines
Method of measurement | Measurement/Question | Use in analysis | |
|---|---|---|---|
Biological and cognitive | |||
Sex | Self-reported | Sex. | Binary variable: girl (1) or boy (0a) |
School achievement | Self-reported | Did you pass with distinction on your final school report in the previous school year? | Binary variable: yes (1) or no (0a) |
Adiposity | Device-measured | Assessed by multi-frequency bioimpedance analysis. | Re-coded as dichotomous: < 85th percentile (1a) or ≥ 85th percentile (0) |
BMI z-score | Anthropometric measurement | World Health Organization BMI z-score based on direct measurement of body height and weight. | Re-coded as dichotomous: < 1 SD (1a) or ≥ 1 SD (0) |
Behavioral | |||
Organized PA | Self-reported | About how many hours a week do you usually spend in organized sport activities in your free time on weekdays/weekend days? | Re-coded as dichotomous: ≥ 1 h a week (1) or < 1 h a week (0a) |
Active play | Self-reported | About how many hours a day do you usually spend in unorganized PA in your free time on weekdays/weekend days? | Re-coded as dichotomous: ≥ 2 h a day (1) or < 2 h a day (0a) |
AT to school | Self-reported | Check the prevailing mode (walk, bicycle, in-line, skateboard, car, bus, train) of transportation on the way to school. | Re-coded as dichotomous: ≥ 3 days a week of AT (1) or < 3 days a week of AT (0a) |
AT from school | Self-reported | Check the prevailing mode (walk, bicycle, in-line, skateboard, car, bus, train) of transportation on the way from school. | Re-coded as dichotomous: ≥ 3 days a week of AT (1) or < 3 days a week of AT (0a) |
Sleep efficiency | Device-measured | Measured by accelerometry and defined as the ratio of time spent in sustained inactivity periods divided by sleep duration. | Re-coded as dichotomous: ≥ 0.85 (1) or < 0.85 (0a) |
Fruit and vegetable intake | Self-reported | About how many times a week do you usually eat or drink a) fruits and b) vegetables? | Re-coded as dichotomous: ≥ 1 day a week (1) or < 1 day a week (0a) for “a” and “b” |
Unhealthy snacking | Self-reported | About how many times a week do you usually eat or drink c) sweets (candy or chocolate), d) coke or other soft drinks that contain sugar, and e) crisps, chips, salt sticks, etc.? | Re-coded as dichotomous: ≥ 1 day a week (1) or < 1 day a week (0a) for “c”, “d” or “e” |
Skipping breakfast | Self-reported | How often do you usually have breakfast (more than a glass of milk or fruit juice) on weekdays/weekend days? | Re-coded as dichotomous: < 4 days a week (1) or ≥ 4 days a week (0a) |
Family | |||
Maternal BMI | Parent-reported | Calculated from the self-reported body height and weight. | BMI computed and re-coded as dichotomous: < 25 kg/m2 (1a) or ≥ 25 kg/m2 (0) |
Maternal education | Parent-reported | Highest educational level. | Re-coded as dichotomous: university and higher education (1) or lower than university education (0a) |
Paternal BMI | Parent-reported | Calculated from the self-reported body height and weight. | BMI computed re-coded as dichotomous: < 25 kg/m2 (1a) or ≥ 25 kg/m2 (0) |
Paternal education | Parent-reported | Highest educational level. | Re-coded as dichotomous: university and higher education (1) or lower than university education (0a) |
Family income | Parent-reported | Is the total gross income of your household greater than 48,000 CZK per month (twice the median in Czechia)? | Binary variable: yes (1) or no (0a) |