Table 3.

Threshold effect analysis of serum uric acid on lumbar bone mineral density in non-Hispanic blacks using the two-piecewise linear regression model.

Lumbar bone mineral density	Adjusted β (95% CI), P value
Non-Hispanic black
Fitting by the standard linear model	0.007 (−0.003, 0.017) 0.1643
Fitting by the two-piecewise linear model
Inflection point	7.5
Serum uric acid <7.5 (mg/dL)	0.018 (0.004, 0.031) 0.0099
Serum uric acid >7.5 (mg/dL)	−0.026 (−0.055, 0.004) 0.0867
Log likelihood ratio	0.018

Age, sex, waist circumference, education, income poverty ratio, physical activity, smoking behavior, alcohol consumption, blood urea nitrogen, C-reactive protein, total protein, total cholesterol, serum phosphorus, serum calcium, and calcium supplementation use were adjusted.