Table 1 Characteristics of participants and health behaviours at baseline and follow up by gender and by cohort
Grade 2 cohort | Grade 4 cohort | Grade 7 cohort | ||||
|---|---|---|---|---|---|---|
Baseline N = 307 | Follow-up N = 299 | Baseline N = 300 | Follow-up N = 294 | Baseline N = 206 | Follow-up N = 202 | |
Girls | N = 151 | N = 148 | N = 157 | N = 155 | N = 98 | N = 97 |
Age (years ± SE) | 8.74 ± 0.03 | 10.74 ± 0.03 | 10.81 ± 0.03 | 12.81 ± 0.03 | 13.90 ± 0.03 | 15.90 ± 0.03 |
Parental education high (%) | - | 69.6 | - | 65.0 | - | 56.1 |
Eats breakfast every school day (%) | 96.6 | 98.4 | 91.7 | 89.1 | 84.5 | 67.5 |
Eats lunch every school day (%) | 96.5 | 91.3 | 87.2 | 76.6 | 65.6 | 73.5 |
Eats vegetables at least twice a day (%) | 44.4 | 40.0 | 35.7 | 24.8 | 28.9 | 32.5 |
Eats fruit at least twice a day (%) | 34.0 | 22.2 | 24.8 | 15.9 | 12.4 | 16.9 |
Eats sweets at most twice a week (%) | 81.4 | 78.4 | 76.1 | 82.4 | 73.2 | 74.7 |
Drinks sweetened drinks at most twice a week (%) | 84.1 | 81.8 | 81.9 | 77.5 | 86.6 | 78.3 |
Watches TV at most three hours every school day (%) | 100.0 | 95.2 | 98.0 | 92.8 | 94.9 | 89.2 |
Is member of a club (%) | 85.5 | 84.1 | 85.9 | 80.4 | 78.1 | 62.7 |
Participates in sports at least three times a week (%) | 31.9 | 54.4 | 50.3 | 57.3 | 56.7 | 51.2 |
Spends at least 30 minutes outdoors every school day (%) | 93.1 | 76.2 | 89.0 | 81.0 | 79.8 | 65.1 |
Walks or bikes to school at least three days a week (%) | 64.8 | 78.6 | 77.1 | 70.4 | 72.6 | 60.5 |
Is physically active during breaks at least 3 days a week (%) | 70.6 | 54.0 | 71.3 | 20.4 | 14.6 | 3.6 |
Obese (%) | 3.3 | 0.7 | 3.2 | 1.9 | 3.1 | 1.0 |
Overweight/obese (%) | 15.9 | 14.6 | 18.5 | 12.1 | 14.3 | 12.2 |
BMIsds (mean ± SE) | 0.27 ± 0.09 | 0.07 ± 0.10 | 0.30 ± 0.08 | 0.33 ± 0.08 | 0.22 ± 0.12 | 0.19 ± 0.10 |
Boys | N = 156 | N = 151 | N = 143 | N = 139 | N = 108 | N = 105 |
Age (years ± SE) | 8.77 ± 0.02 | 10.77 ± 0.02 | 10.80 ± 0.02 | 12.80 ± 0.02 | 13.91 ± 0.03 | 15.91 ± 0.03 |
Parental education high (%) | - | 65.5 | - | 62.0 | - | 60.2 |
Eats breakfast every school day (%) | 97.4 | 95.6 | 94.3 | 86.9 | 86.8 | 75.0 |
Eats lunch every school day (%) | 97.4 | 85.3 | 88.7 | 82.0 | 63.2 | 76.1 |
Eats vegetables at least twice a day (%) | 31.1 | 25.2 | 36.9 | 18.0 | 21.7 | 20.5 |
Eats fruit at least twice a day (%) | 29.1 | 14.1 | 23.9 | 11.5 | 14.2 | 9.3 |
Eats sweets at most twice a week (%) | 79.3 | 83.2 | 78.2 | 80.3 | 74.5 | 69.3 |
Drinks sweetened drinks at most twice a week (%) | 81.3 | 79.4 | 72.5 | 70.5 | 58.5 | 48.9 |
Watches TV at most three hours every school day (%) | 100.0 | 97.1 | 98.6 | 95.0 | 92.3 | 87.5 |
Is member of a club (%) | 86.7 | 82.5 | 90.9 | 76.9 | 77.4 | 65.9 |
Participates in sports at least three times a week (%) | 56.7 | 66.4 | 69.7 | 64.5 | 78.1 | 62.5 |
Spends at least 30 minutes outdoors every school day (%) | 92.7 | 86.8 | 89.7 | 76.0 | 83.0 | 78.4 |
Walks or bikes to school at least three days a week (%) | 54.7 | 76.7 | 83.6 | 61.0 | 78.3 | 56.3 |
Is physically active during recess at least 3 days a week (%) | 80.3 | 81.6 | 86.4 | 40.5 | 48.1 | 19.5 |
Obese (%) | 2.6 | 5.1 | 4.9 | 5.6 | 1.9 | 1.9 |
Overweight/obese (%) | 20.5 | 18.6 | 20.3 | 18.2 | 18.5 | 15.7 |
BMIsds (mean ± SE) | 0.53 ± 0.10 | 0.61 ± 0.11 | 0.55 ± 0.10 | 0.41 ± 0.10 | 0.33 ± 0.10 | 0.27 ± 0.10 |