Table 3. Stratified analysis between total cholesterol and lumbar bone mineral density.

	Total cholesterol (tertiles)
	Low	Middle β (95%CI) P value	High β (95%CI) P value
Age
60-69 years	Reference	-0.01 (-0.03, 0.01) 0.2533	-0.05 (-0.07, -0.03) <0.0001
>= 70 years	Reference	-0.04 (-0.06, -0.02) 0.0009	-0.10 (-0.13, -0.08) <0.0001
Sex
Male	Reference	-0.00 (-0.02, 0.02) 0.9288	-0.01 (-0.03, 0.01) 0.3765
Female	Reference	-0.01 (-0.03, 0.01) 0.3765	-0.03 (-0.05, -0.01) 0.0021
Race ethnicity
Non-Hispanic White	Reference	-0.02 (-0.04, -0.01) 0.0059	-0.08 (-0.10, -0.06) <0.0001
Non-Hispanic Black	Reference	-0.03 (-0.07, 0.02) 0.2688	-0.02 (-0.06, 0.03) 0.4768
Other Hispanic	Reference	-0.00 (-0.08, 0.08) 0.9424	0.02 (-0.05, 0.10) 0.5491
Other races - Including multi-racial	Reference	-0.05 (-0.14, 0.04) 0.2654	-0.07 (-0.15, 0.01) 0.0969
Physical activity
Sedentary	Reference	-0.04 (-0.07, -0.01) 0.0096	-0.07 (-0.10, -0.05) <0.0001
Low	Reference	-0.07 (-0.10, -0.03) <0.0001	-0.08 (-0.11, -0.05) <0.0001
Moderate	Reference	-0.02 (-0.06, 0.03) 0.4257	-0.09 (-0.13, -0.04) <0.0001
High	Reference	0.01 (-0.02, 0.04) 0.6042	-0.04 (-0.07, -0.01) 0.0139
Income to poverty ratio (tertiles)
0-1.37	Reference	-0.03 (-0.06, -0.00) 0.0432	-0.04 (-0.07, -0.02) 0.0024
1.38-2.91	Reference	-0.03 (-0.06, 0.00) 0.0799	-0.07 (-0.10, -0.04) <0.0001
2.93-5.00	Reference	-0.03 (-0.05, -0.00) 0.0475	-0.07 (-0.10, -0.04) <0.0001
Blood urea nitrogen (tertiles, mg/dL)
2.00 - 12.00	Reference	-0.04 (-0.06, -0.01) 0.0147	-0.05 (-0.08, -0.02) 0.0003
13.00 - 16.00	Reference	-0.01 (-0.03, 0.02) 0.6859	-0.06 (-0.09, -0.03) <0.0001
17.00 - 98.00	Reference	-0.03 (-0.06, -0.01) 0.0120	-0.09 (-0.11, -0.06) <0.0001
Total protein (tertiles, mg/dL)
5.40 - 7.00	Reference	-0.03 (-0.05, 0.00) 0.0764	-0.07 (-0.10, -0.04) <0.0001
7.10 - 7.40	Reference	-0.03 (-0.05, 0.00) 0.0509	-0.05 (-0.07, -0.02) 0.0002
7.50 - 11.00	Reference	-0.02 (-0.05, 0.01) 0.1544	-0.08 (-0.11, -0.05) <0.0001
Serum uric acid (tertiles, mg/dL)
1.50 - 4.80	Reference	-0.00 (-0.03, 0.02) 0.7715	-0.07 (-0.09, -0.04) <0.0001
4.90 - 6.00	Reference	-0.01 (-0.03, 0.02) 0.6510	-0.04 (-0.07, -0.01) 0.0051
6.10 - 13.70	Reference	-0.04 (-0.07, -0.02) 0.0016	-0.07 (-0.10, -0.05) <0.0001
Serum calcium (tertiles, mg/dL)
6.70 - 9.20	Reference	-0.05 (-0.08, -0.02) 0.0014	-0.07 (-0.10, -0.04) <0.0001
9.30 - 9.50	Reference	0.00 (-0.03, 0.03) 0.9714	-0.07 (-0.09, -0.04) <0.0001
9.60 – 11.30	Reference	-0.02 (-0.05, 0.00) 0.0913	-0.06 (-0.08, -0.03) <0.0001
Body mass index (tertiles)
15.18 - 25.72	Reference	-0.00 (-0.03, 0.02) 0.7332	-0.06 (-0.09, -0.03) <0.0001
25.73 – 29.86	Reference	-0.00 (-0.03, 0.02) 0.6066	-0.06 (-0.09, -0.04) <0.0001
29.87 – 57.31	Reference	-0.03 (-0.06, -0.01) 0.0111	-0.06 (-0.09, -0.04) <0.0001