Table 3. Comparison of bone mineral density and fracture risks in different age groups.

	Natural menopause		Surgical menopause
	Median	Min-Max	Median	Min-Max	p
Femur neck BMD
<50 years	-1.1	-3.4 - 1.1	-0.1	-2.8 - 1.5	0.021
50-60 years	-1.2	-2.90 - 2.90	-0.55	-2.5 - 0.9	0.024
>60 years	-1.4	-3 - 1.30	-1.6	-3.1 - 0.9	0.672
Lumbar BMD
<50 years	-1.7	-3.3 - 2.5	-1.2	-2.9 - 0.3	0.077
50-60 years	-1.6	-3.9 - 1	-1.4	-3.3 - 0.6	0.398
>60 years	-2.0	-3.8 - 0.9	-2.0	-3 - 0.9	0.330
The 10-year probability of fracture risk without femur neck BMD (%) without neck BMD (%)
Major osteoporotic
<50 years	3.5	2.6-8.5	3.5	2.7-7.2	0.633
50-60 years	3.6	2-14	3.5	2.5-8.5	0.654
>60 years	5.1	2.8-19	4.5	3-9.2	0.147
Hip fractures
<50 years	0.3	0.1-1.6	0.2	0.1-0.5	0.173
50-60 years	0.4	0.1-2.0	0.4	0.1-2.0	0.396
>60 years	0.95	0.3-8	0.8	0.4-3.1	0.165
The 10-year probability of fracture risk with femur neck BMD (%)
Major osteoporotic
<50 years	4.4	3.2-29	3.6	3.1-7.9	0.041
50-60 years	4.2	2.4-18.0	3.45	2.6-14	0.177
>60 years	4.95	1-13	5	2.5-11	0.784
Hip fractures
<50 years	0.4	0-20	0.1	0-4.30	0.028
50-60 years	0.5	0-9.3	0.25	0-5	0.690
>60 years	0.90	0-4.6	0.80	0-4	0.672
Min: Minimum; Max: Maximum; BMD: Bone mineral density.