Table 3

Correlation analysis of variables associated with bone mass

		BMC of the distal radius		BMD of the L2 to L4 vertebrae
		Boys			Girls			Boys			Girls
		n	r		p value3-150	n		r	p value3-150		n	r	p value3-150	n	r	p value3-150
Age	92	0.542	< 0.001	87	0.275	0.010	92	0.685	< 0.001	87	0.313	0.003
Weight	92	0.671	< 0.001	87	0.534	< 0.001	92	0.591	< 0.001	87	0.647	< 0.001
Height	92	0.652	< 0.001	87	0.479	< 0.001	92	0.647	< 0.001	87	0.462	< 0.001
Bone width	92	0.764	< 0.001	87	0.714	< 0.001	92	0.558	< 0.001	87	0.340	0.001
Length of L2–L4	92	0.657	< 0.001	87	0.471	< 0.001	92	0.702	< 0.001	87	0.618	< 0.001
Calcium intake	92	0.105	0.320	87	−0.264	0.014	92	0.099	0.349	87	−0.142	0.189

Physical fitness
3 minute step test recovery index	92	0.059	0.580	87	0.007	0.946	92	0.064	0.547	87	0.098	0.368
Sit and reach test	92	0.526	< 0.001	87	0.250	0.020	92	0.340	0.001	87	0.336	0.001
1 minute sit ups	92	0.200	0.056	85	0.309	0.004	92	0.219	0.036	85	0.341	0.001
Grip strength	92	0.777	< 0.001	87	0.539	< 0.001	92	0.763	< 0.001	87	0.555	< 0.001
Vertical jump	92	0.368	< 0.001	87	0.149	0.168	92	0.506	< 0.001	87	0.280	0.009