Table 1

Descriptive statistics of the study sample, by sex
N = 4637 Boys Girls
2121 2516
Mean SD Mean SD p-value
Age (years) 11.6 0.73 11.6 0.73 0.089
Sugared drinks (liters/day) 0.63 0.63 0.52 0.58 <0.001
Breakfast (days/week) 6.02 1.80 5.95 1.81 0.179
Active transportation (min/week) 53.55 54.85 54.95 58.61 0.408
Sports participation (hours/week) 4.23 2.77 3.30 2.62 <0.001
TV viewing (hours/week) 13.43 6.93 12.49 6.83 <0.001
Computer use (hours/week) 10.52 7.06 7.71 6.16 <0.001
Sleep duration (hours/day) 9.05 0.86 9.07 0.89 0.388
n % n % p-value
High parental education (n [%]) 1449 68.3 1690 67.2 0.698
Normalweight (n [%]) 1548 73.0 1975 78.5 <0.001
Overweight (n [%]) 466 22.0 441 17.5 <0.001
Obese (n [%]) 107 5.0 100 4.0 0.092

Fernández-Alvira et al.

Fernández-Alvira et al. International Journal of Behavioral Nutrition and Physical Activity 2013 10:80   doi:10.1186/1479-5868-10-80

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