Table 2.

The correlation between serum total alkaline phosphatase (IU/L) and lumbar bone mineral density (g/cm2)

	Model 1 β (95% CI) P value	Model 2 β (95% CI) P value	Model 3 β (95% CI) P value
total alkaline phosphatase (IU/L)	-0.0010 (-0.0012, -0.0008) < 0.000001	-0.0008(-0.0010, -0.0007) < 0.000001	-0.0007(-0.0009, -0.0005) < 0.000001
total alkaline phosphatase categories
Q1 (7–50)	Reference	Reference	Reference
Q2 (51–60)	-0.0136 (-0.0237, -0.0035) 0.008490	-0.0101(-0.0199, -0.0003) 0.042459	-0.0088(-0.0186, 0.0010) 0.077081
Q3 (61–74)	-0.0337(-0.0436, -0.0238) < 0.000001	-0.0263(-0.0360, -0.0167) < 0.000001	-0.0235(-0.0333, -0.0138) 0.000002
Q4 (75–326)	-0.0603(-0.0704, -0.0502) < 0.000001	-0.0519(-0.0618, -0.0420) < 0.000001	-0.0459(-0.0562, -0.0356) < 0.000001
P for trend	< 0.001	< 0.001	< 0.001

Model 1, no covariates were adjusted

Model 2, age, sex, race/ethnicity were adjusted

Model 3, age, sex, race/ethnicity, education, income to poverty ratio, waist circumference, smoking behavior, alcohol consumption, blood urea nitrogen, serum uric acid, total protein, total cholesterol, serum phosphorus, serum calcium and calcium supplementation were adjusted