Table 5. Multivariate regression analysis of body indexes contributing to a low BMD.

	Total			High body weight group			Low body weight group
	OR	P	R2	OR	P	R2	OR	P	R2
Weight	0.902	< 0.001	0.333	0.941	0.022	0.272	0.821	<0.001	0.267
BMI (kg/m2)	0.755	< 0.001	0.331	0.848	0.024	0.271	0.581	<0.001	0.266
ASMI (kg/m2)	0.438	< 0.001	0.303	0.659	0.030	0.270	0.455	0.004	0.220

Adjusted for age, gender, height, smoking frequency, vitamin D, PTH and ALP levels, FEV₁ (%) and physical inactivity level.

OR, odds ratio: CI, confidence interval: R², adjusted R²; BMI, body mass index; ASMI, appendicular skeletal muscle mass index.