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Table 3 Primary and secondary outcomes at baseline and at follow-up measurements by treatment groupa

From: A school-based intervention improved dietary intake outcomes and reduced waist circumference in adolescents: a cluster randomized controlled trial

  Measurement Intervention group Control group
  n Median (25th–75th) or % n Median (25th–75th) or %
Fruit and vegetables (g/d) Baseline 691 204.6 (119.1–337.0) 689 191.5 (104.1–304.2)
First follow-up 618 176.7 (111.0–274.3) 612 164.4 (99.0–247.8)
Second follow-up 546 150.6 (101.2–248.1) 532 153.1 (48.6–181.9)
Added sugar (g/d) Baseline 691 68.2 (48.1–92.7) 689 68.9 (84.2–240.4)
First follow-up 618 58.1 (42.7–77.5) 612 60.3 (44.6–82.9)
Second follow-up 546 57.1 (41.7–75.2) 532 62.8 (42.9–85.0)
Total fat (E %/d) Baseline 691 25.5 (22.0–29.0) 689 25.3 (21.6–29.2)
First follow-up 618 25.5 (21.7–29.3) 612 26.3 (22.4–30.2)
Second follow-up 546 25.9 (22.1–30.5) 532 26.2 (22.5–30.5)
Unhealthy snackingb(g/d) Baseline 691 94.5 (27.5–220.0) 689 97.5 (40.0–258.0)
First follow-up 618 63.8 (0.00–184.6) 612 81.5 (12.6–204.6)
Second follow-up 546 60.0 (0.00–180.0) 532 98.1 (16.3–233.8)
Unhealthy snacking at school (% of consumers) Baseline 691 18.4 689 20.6
First follow-up 618 18.1 612 31.4
Second follow-up 546 26.5 532 32.3
Breakfast intake (% of consumers) Baseline 691 78.4 689 75.6
First follow-up 618 79.3 612 77.3
Second follow-up 546 74.0 532 80.8
Waist circumference (cm) Baseline 691 68.9 (9.0) 692 68.3 (8.1)
First follow-up 615 68.3 (8.0) 607 69.4 (7.6)
Second follow-up 543 71.1 (8.4) 530 71.2 (7.9)
  1. aSummary statistics using all the available individual data at baseline and follow-up points adjusted for the cluster design
  2. bConsumption of unhealthy foods eaten during snack time; i.e. table sugar, sweets, salty snacks, fast food, soft drinks and packaged food