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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]