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Table 1 Characteristics of participant schools and students

From: The impact of summer vacation on children’s obesogenic behaviors and body mass index: a natural experiment

  A Year-round Calendar B Traditional Calendar C Traditional Calendar All Schools
Participating School Characteristics
 Total Students 389 443 417 1249
 Male (%) 49.4 60.5 50.4 53.6
 Age in Years 4–12 years 4–12 years 5–12 years 4–12 years
 Grades prek-6 prek-6 k-6 prek-6
 Race     
  White (%) 28.8 23.5 34.3 28.7
  Black (%) 60.9 67.0 55.9 61.4
  Other Race/ethnicity (%) 10.3 8.5 8.8 8.8
 Free & Reduced Priced Lunch (%) 81.0 87.0 84.0 84.0
Current Study Participant Characteristics at Baseline
 Number of participants 97 93 95 285 a
 Male (%) 59.2 44.2 41.5 48.7
 Age in Years (SD) 7.3 (1.3) 7.6 (1.3) 7.2 (1.2) 7.4 (1.3)
 Grade (SD) 2.4 (1.2) 2.4 (1.2) 2.2 (1.1) 2.3 (1.1)
 BMI z-score (SD) 0.56 (1.14) 0.59 (1.40) 0.66 (1.21) 0.61 (1.23)
 Household Income     
  < 40,000 (%) 55.9 60.0 55.3 57.0
  ≥ 40,000 (%) 44.1 40.0 44.7 43.0
 Race     
  White (%) 24.7 19.6 42.4 29.5
  Black (%) 59.0 78.4 39.4 57.4
  Other Race/ethnicity (%) 6.9 0.0 13.6 7.4
  Not reported (%) 9.8 2.0 4.6 5.8
 Mean Number of Measurement Waves with Valid Data (range 1–4) 2.9 2.4 2.6 2.6
 Mean Number of Valid Days of Data     
  Physical Activity (SD)b 70.4 (31.4) 50.5 (33.5) 68.8 (39.0) 63.6 (31.0)
  Sleep (SD) b 35.4 (26.0) 24.6 (30.3) 32.5 (23.0) 30.9 (26.2)
  Foods Consumed & Screen Time (SD) c 26.8 (20.5) 20.3 (19.3) 23.4 (20.4) 23.6 (20.1)
  1. a Includes total number of unique children providing valid data from the original and refresh cohort
  2. b Maximum of 142 wear days
  3. c Maximum of 41 possible daily diary reports