Table 1

Basic characteristics
All (N = 468) Girls (N = 225) Boys (N = 243) P-value for difference*
Age (years) 7.6 ± 0.4 7.6 ± 0.4 7.7 ± 0.4 0.180
Height (cm) 128.7 ± 5.7 127.6 ± 5.6 129.7 ± 5.5 <0.001
Weight (kg) 26.8 ± 5.7 26.4 ± 5.0 27.1 ± 4.7 0.113
Body mass index 16.1 ± 2.1 16.1 ± 2.2 16.1 ± 2.0 0.767
Body mass index standard deviation scorea -0.20 ± 1.1 -0.18 ± 1.1 -0.22 ± 1.1 0.662
Waist circumference (cm) 56.6 ± 5.5 55.9 ± 5.8 57.2 ± 5.2 0.008
Body fat percentage (%) 19.6 ± 8.1 22.4 ± 7.6 17.0 ± 7.7 <0.001
Fasting serum insulin (mU/I) 4.5 ± 2.5 4.8 ± 2.3 4.3 ± 2.6 0.003
Fasting plasma glucose (mmol/l) 4.8 ± 0.4 4.8 ± 0.4 4.9 ± 0.4 0.004
Fasting plasma triglycerides (mmol/l) 0.60 ± 0.24 0.62 ± 0.25 0.58 ± 0.23 0.052
Fasting plasma HDL cholesterol (mmol/l) 1.60 ± 0.31 1.57 ± 0.31 1.64 ± 0.32 0.011
Fasting plasma LDL cholesterol (mmol/l) 2.36 ± 0.51 2.41 ± 0.53 2.31 ± 0.49 0.022
Fasting plasma VLDL triglycerides (mmol/l)b 0.28 ± 0.20 0.30 ± 0.21 0.27 ± 0.19 0.272
Fasting plasma VLDL cholesterol (mmol/l)b 0.12 ± 0.10 0.13 ± 0.11 0.12 ± 0.10 0.466
Fasting plasma HDL triglycerides (mmol/l)b 0.16 ± 0.04 0.16 ± 0.04 0.15 ± 0.03 0.389
Fasting plasma total cholesterol (mmol/l) 4.27 ± 0.62 4.31 ± 0.63 4.23 ± 0.61 0.149
Systolic blood pressure (mmHg) 100.1 ± 7.3 99.8 ± 7.6 100.4 ± 7.1 0.418
Diastolic blood pressure (mmHg) 61.7 ± 6.6 61.5 ± 6.8 61.8 ± 6.5 0.629
Cardiometabolic risk score -0.03 ± 3.51 0.02 ± 3.42 -0.08 ± 3.60 0.740
Total physical activity (min/d)c 111.4 ± 42 104.3 ± 39.1 117.9 ± 43.7 <0.001
 Unstructured physical activity (min/d) 49.7 ± 31.5 44.6 ± 30.8 54.4 ± 31.4 0.001
 Structured exercise (min/d)d 6.4 ± 11.3 5.0 ± 7.3 7.7 ± 13.9 0.009
 Organised sports (min/d) 8.4 ± 11.8 7.5 ± 11.3 9.2 ± 12.2 0.120
 Commuting to and from school (min/d) 18 ± 16.3 18.8 ± 16.8 17.3 ± 15.8 0.320
 Physical activity during recess (min/d)d 16 ± 4.2 15.5 ± 4.1 16.5 ± 4.3 0.016
Total sedentary behaviour (min/d) 212.3 ± 99.7 220.5 ± 97.5 204.7 ± 101.3 0.087
 Electronic media time (min/d)d 101.9 ± 52.4 89.5 ± 46.3 113.2 ± 55 <0.001
  Watching television and videos (min/d)d 67.7 ± 33.2 68.2 ± 33.9 67.3 ± 32.6 0.754
  Using a computer and playing video games (min/d) 30.9 ± 31.1 19.2 ± 22.3 41.8 ± 34.0 <0.001
  Using a mobile phone and playing mobile games (min/d) 3.2 ± 8.8 2.1 ± 5.9 4.2 ± 10.8 0.012
 Listening to music (min/d) 12.9 ± 21.0 15.7 ± 23.2 10.2 ± 18.5 0.005
 Playing a musical instrument (min/d) 3.1 ± 10.0 4.2 ± 11.5 2.1 ± 8.3 0.026
 Reading (min/d)d 23.4 ± 23.2 25.1 ± 21.8 21.9 ± 24.4 0.145
 Writing (min/d) 6.7 ± 12.3 9.7 ± 13.9 3.9 ± 9.9 <0.001
 Drawing (min/d) 25.5 ± 25.2 33.4 ± 27.0 18.1 ± 20.9 <0.001
 Doing arts and crafts (min/d) 13.5 ± 20.2 19.5 ± 21.6 8.0 ± 17.1 <0.001
 Playing board games (min/d) 15.1 ± 18.3 14.5 ± 16.5 15.6 ± 19.8 0.524
 Resting (min/d)e 10.6 ± 25.6 9.4 ± 24.9 11.6 ± 26.1 0.366
Maximal work load during exercise test (W/kg of body lean mass)f 3.7 ± 0.52 3.6 ± 0.50 3.8 ± 0.50 <0.001
Maximal work load during exercise test (W/kg of total body mass)f 2.9 ± 0.54 2.7 ± 0.46 3.1 ± 0.53 <0.001

Basic characteristics in girls and boys are presented as means and standard deviations. P-values <0.05 are bolded.

*Differences in means between girls and boys were analysed with independent samples t-test, aBased on Finnish reference values, bAll N = 388, Girls N = 178, Boys N = 210, cIncludes 90 minutes of physical activity during physical education per week, dN = 467, eN = 464, fN = 465.

Väistö et al.

Väistö et al. International Journal of Behavioral Nutrition and Physical Activity 2014 11:55   doi:10.1186/1479-5868-11-55

Open Data