Table 4 Threshold effect analysis of waist circumference (cm) on femoral neck bone mineral density (mg/cm2) in older adults using two-piecewise linear regression model
From: The association between abdominal obesity and femoral neck bone mineral density in older adults
Femoral neck bone mineral density | Adjusted ß (95% CI) |
|---|---|
Men | |
Fitting by standard linear model | −1.5 (−2.4, −0.6) < 0.001 |
Fitting by two-piecewise linear model | |
Inflection point | 95 |
Waist circumference < 95 (cm) | 1.3 (−0.1, 2.8) 0.068 |
Waist circumference > 95 (cm) | −2.5 (−3.4, −1.5) < 0.001 |
Log likelihood ratio | < 0.001 |
Women | |
Fitting by standard linear model | 0.0 (−0.7, 0.7) 0.987 |
Fitting by two-piecewise linear model | |
Inflection point | 95 |
Waist circumference < 95 (cm) | 1.6 (0.7, 2.5) < 0.001 |
Waist circumference > 95 (cm) | −1.6 (−2.5, −0.7) < 0.001 |
Log likelihood ratio | < 0.001 |