Table 1

Participant characteristics

Variables

Total (N = 2527)


Age (years)

13 (10-16)

Gender (%)

Male

50.8

Female

49.2

Race (%)

Non-Hispanic white

38.3

Non-Hispanic black

24.4

Hispanic

32.7

Other

4.6

Accelerometer-derived variables

Total wear time (minutes/day)

834 (779-894)

Sedentary behavior (% of total time)

50.8 (42.1-58.9)

Bouts of sedentary behavior (% of total time)

24.5 (14.4-36.1)

Breaks in bouts of sedentary behavior (% of bouts)

13.5 (12.1-15.3)

MVPA (% of total time)

4.1 (1.6-8.5)

Low intensity activity (% of total time)

43.8 (38.0-49.6)

Questionnaire-derived variables

TV (hours/day)

2.0 (1.0-3.0)

Computer (hours/day)

0.5 (0.0-1.0)

Cardio-metabolic risk score components

Waist circumference (cm)

72.9 (64.5-82.7)

Systolic blood pressure (mmHg, N = 2265)

107 (100-114)

Non-HDL (mmol/l)

2.7 (2.3-3.2)

C - reactive protein (mmol/l)

0.002 (0.001-0.007)


Data presented as median (inter-quartile range) or %. MVPA = moderate-to-vigorous intensity physical activity; Non-HDL = non-HDL cholesterol

Carson and Janssen BMC Public Health 2011 11:274   doi:10.1186/1471-2458-11-274

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