Table 5.

Comparison of bone density of left femur between two groups before and after treatment (x̅±s)

	Group	Number of samples	Before treatment	After treatment	t	P
Left femoral bone density (g/cm2)	Zhuanggu Zhitong Recipe Group	46	0.440±0.020	0.637±0.024	-34.67	0.001
	Alendronate sodium group	45	0.444±0.019	0.655±0.024	-42.95	0.001

Note: The difference in bone density between the Zhuanggu Zhitong Recipe group and the alendronate sodium group before and after treatment was calculated separately. A normality test was performed on the differences between the two groups. The results were 0.776 and 0.266 respectively, which satisfies normality. Therefore, paired samples T test was used.