Table 2.

Subject distribution and baseline characteristics of each dataset

		Overall	Training dataset	Validation dataset	Test dataset	F	P
		n = 1048	n = 530	n = 100	n = 418
Gender, n, %	Male Female	605, 57.73%	305, 57.55%	62, 62.00%	238, 56.94%	0.862*	0.650
		443, 42.27%	225, 42.45%	38, 38.00%	180, 43.06%
Age(yr.), mean ± SD		51.19 ± 14.35	51.04 ± 14.4	51.11 ± 12.73	51.70 ± 14.97	0.255	0.775
BMD (mg/cm3), mean ± SD		130.28 ± 42.76	129.92 ± 42.78	131.30 ± 39.29	130.90 ± 42.96	0.084	0.919
BMD categories, n (%)	Normal	621, 27.96%	310, 58.49%	60, 60.00%	251, 60.05%
	Osteopenia	296, 59.64%	150, 28.30%	30, 30.00%	116, 27.75%	0.994*	0.911
	OP	131, 12.40%	70, 13.21%	10, 10.00%	51, 12.20%

Note BMD-Bone mineral density. F-Variance analysis of bone mineral density differences in subjects of different ages. *- chi-square test