A cross-sectional survey of factors influencing bone mass in junior high school students

Table 6 Multiple linear regression analysis regarding five factors for OSI

	Boys (N = 4,974)		Girls who have reached menarche (N = 4,184)		Girls who have not reached menarche (N = 585)
	β	P value	β	P value	β	P value
Age	0.260	<0.001	0.140	<0.001	0.085	0.034
Body mass index	0.300	<0.001	0.302	<0.001	0.135	0.001
Current exercise habits	0.106	<0.001	0.237	<0.001	0.242	<0.001
Milk intake per day in PS	0.085	<0.001	0.039	0.083	0.114	0.141
Current milk intake per day	0.000	0.984	0.029	0.195	−0.064	0.411
Bone fracture during the preceding year	−0.017	0.190	0.036	0.012	0.045	0.266

OSI osteo-sono assessment index, PS primary school, β standardized partial regression coefficient

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