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

Table 4 Effect of the physical activity on BMD at follow up

Variable	Coefficient estimate	Standard error	P- value
BMD _baseline	0.966	0.02	<0.001
$θ_{mh} = log (\frac{π_{mh}}{π_{l}})$	0.009	0.001	<0.001
Height _{follow up}	0.001	0.0002	<0.001
Log(weight _{follow up})	0.039	0.008	<0.001
Gender	0.017	0.005	0.001
Puberty _{follow up}	0.016	0.002	<0.001
Gender # puberty¹	−0.014	0.003	<0.001
Intercept	−0.150	0.018	<0.001

Note: π _mh ,π _lrepresents the percentage of the total time spent in, moderate-high and low intensity activity respectively. #: Interaction. The girls were chosen as the reference level for gender.

ISSN: 1471-2431