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Table 1 Baseline characteristics of participants included in analyses

From: Cross-sectional and prospective mediating effects of dietary intake on the relationship between sedentary behaviour and body mass index in adolescents

Variables TV and zBMI (n = 259) Sedentary time and zBMI (n = 140)
Age, years 12.9 (12.9, 13.0) 12.9 (12.9, 13.0)
Sex, %
 Male 47.5 (41.4, 53.6) 50.0 (41.7, 58.3)
 Female 52.5 (46.4, 58.4) 50.0 (41.7, 58.3)
Maternal education, %
 Low 6.9 (4.4, 10.8) 5.0 (2.3, 10.2)
 Medium 65.3 (59.2, 70.8) 62.8 (54.4, 70.5)
 High 27.8 (22.7, 33.6) 32.1 (24.8, 40.4)
Pubertal status, %
 Early puberty 19.3 (8.0, 4.6) 14.3 (35.1, 56.2)
 Mid-pubertal 35.5 (30.0, 41.6) 41.4 (33.5, 50.0)
 Late-pubertal 35.5 (30.0, 41.6) 35.0 (27.5, 43.4)
 Post-pubertal 27.0 (21.9, 32.8) 22.1 (16.0, 30.0)
BMI
 kg/m2 20.7 (20.2, 21.3) 20.3 (19.7, 21.0)
 z-score 0.4 (0.3, 0.5) 0.3 (0.1, 0.5)
 Overweight, % 18.9 (14.6, 24.2) 13.6 (8.8, 20.4)
 Obese, % 9.2 (6.3, 13.5) 9.2 (5.4, 15.4)
Sedentary behaviour
 TV viewing (hours/day) 3.2 (3.0, 3.4)  
 Total sedentary time (hours/day)   6.1 (6.0, 6.2)
 Average sedentary bout (minutes/day)   6.6 (6.5, 6.6)
MVPA (minutes/day)   48.2 (35.0, 61.4)
Dietary intake
 Discretionary foods (freq/day) 2.4 (2.2, 2.6) 2.4 (2.1, 2.7)
 Sugar-sweetened beverages (freq/day) 2.1 (1.8, 2.3) 1.9 (1.6, 2.2)
 Takeaway food (freq/week) 3.4 (3.1, 3.6) 3.2 (2.8, 3.6)
  1. BMI body mass index, zBMI BMI z-score, TV television, MVPA moderate-to-vigorous physical activity; freq: frequency
  2. Footnote: Maternal education: low = some secondary education or less; medium = completing secondary school, an apprenticeship or technical certificate; high = university or tertiary qualification. Pubertal status self-assessed using the ‘Tanner Stages’ [25]. BMI z-score determined using the age- and sex-specific CDC 2000 reference data [18]. Overweight and obesity determined using the International Obesity Task Force (IOTF) criteria [19]