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Table 2 Descriptive statistics of the participants with complete datasets n = 602 at follow up

From: The intensity of physical activity influences bone mineral accrual in childhood: the childhood health, activity and motor performance school (the CHAMPS) study, Denmark

Variable Sex Mean (SD) 25th% Median 75th%
Age (yrs.) Boys 11.5 (0.89) 10.8 11.4 12.2
Girls 11.5 (0.87) 10.7 11.4 12.2
Height (cm) Boys 151.2 (8.88) 145 151.1 156.5
Girls 150.5 (8.3) 144.4 150.4 156.5
Weight (kg) Boys 40.7 (8.46) 34.5 39.3 45.2
Girls 40.9 (8.81) 34.8 40.05 46
Fat mass (kg) Boys 8.2 (5.02) 4.6 6.8 10.2
Girls 10.5 (5.0) 6.8 9.5 13.03
Lean mass (kg) Boys 30.7 (4.97) 27.2 30.1 33.2
Girls 28.4 (4.96) 24.5 27.8 31.8
BMC (g) Boys 1189 (267) 1007 1169 1314
Girls 1183 (313) 945.5 1142 1363
BMD (g/cm2) Boys 0.83 (0.06) 0.79 0.83 0.87
Girls 0.83 (0.08) 0.78 0.83 0.88
BA (cm2) Boys 1405 (222) 1246 1399 1540
Girls 1390 (249) 1211.2 1372.3 1545.5
Accelerometer (Days registered) Boys 6.1 (0.97) 5 6 7
Girls 6.1 (0.96) 5 6 7
Sedentary Activity (%) Boys 62 58 62 65
Girls 64 61 64 68
Low activity (%) Boys 29 26 29 31
Girls 29 26 29 31
Moderate to high activity (%) Boys 9 6 7 9
Girls 7 6 7 9
Pubertal stages Boys (n) Girls (n)    
Tanner stage 1 (n) 55 97    
Tanner stage 2 (n) 139 124    
Tanner stage 3 (n) 87 102    
Tanner stage 4 (n) 15 23    
Tanner stage 5 (n) 3 2    
Fishers exact test    <0.001*   
  1. October 2010 to March 2011. Figures are means (SD) presented along with median, 25th% and 75th%.
  2. Note: *The Fishers exact refers to the comparison of the pubertal stages between boys and girls at follow-up.