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Table 2 Baseline data and annual changes evaluating the effect of school transportation mode for girls, anthropometrics, bone mineral content (BMC) and bone width are included, data are presented as mean (SD).

From: The mode of school transportation in pre-pubertal children does not influence the accrual of bone mineral or the gain in bone size - two year prospective data from the paediatric osteoporosis preventive (POP) study

  Girls (N = 65)
  Base line Annual changes (unadjusted) Annual changes (adjusted)
  Walking or cycling Car or bus p - value Walking or cycling Car or bus p - value Walking or cycling Car or bus p - value
Numbers N = 48 N = 17   N = 48 N = 17   N = 48 N = 17  
Age (yrs) 7.9 (0.6) 7.5 (0.5) 0.06 --- --- ---    
Weight (kg) 27.8 (5.9) 26.0 (5.0) 0.28 3.6 (1.6) 3.1 (1.3) 0.28    
Height (cm) 128.5 (7.4) 126.6 (4.5) 0.31 5.7 (0.9) 5.7 (0.6) 0.88    
Lean mass (kg) 20.1 (2.9) 19.3 (2.0) 0.25 2.0 (0.6) 1.7 (0.5) 0.19 1.9 (0.4) 1.8 (0.4) 0.14
Fat mass (kg) 5.6 (3.9) 4.6 (3.3) 0.35 1.5 (1.1) 1.4 (1.1) 0.87 1.5 (1.1) 1.4 (1.1) 0.63
BMC (g)          
L2-L4 15.4 (3.1) 14.5 (3.0) 0.31 2.0 (0.7) 2.0 (0.8) 0.91 2.0 (0.6) 2.0 (0.6) 0.85
Third lumbar vertebra 5.1 (1.1) 4.8 (1.1) 0.30 0.66 (0.4) 0.74 (0.3) 0.40 0.66 (0.2) 0.72 (0.2) 0.36
Femoral neck 2.7 (0.7) 2.5 (0.4) 0.26 0.29 (0.4) 0.32 (0.2) 0.76 0.29 (0.3) 0.30 (0.3) 0.96
Ward 1.2 (0.6) 1.0 (0.2) 0.18 0.13 (0.3) 0.17 (0.1) 0.67 0.13 (0.3) 0.15 (0.3) 0.89
Trochanter 2.7 (1.5) 2.4 (0.8) 0.47 0.58 (0.6) 0.56 (0.3) 0.91 0.59 (0.6) 0.54 (0.6) 0.76
Bone Width (cm)          
Third lumbar vertebra 2.90 (0.28) 2.82 (0.20) 0.28 0.10 (0.07) 0.13 (0.05) 0.22 0.11 (0.06) 0.12 (0.06) 0.33
Femoral neck 2.48 (0.19) 2.36 (0.11) 0.03 0.08 (0.11) 0.06 (0.08) 0.48 0.09 (0.09) 0.03 (0.09) 0.18