Table 3. Association between different obesity phenotypes with the presence of low BMD and osteoporosis.

	Variable	Model a 1 OR (95% CI)	P Value	Model a 2 OR (95% CI)	P Value	Model a 3 OR (95% CI)	P Value
Low BMD
BMI	Obese	Reference	-	Reference	-	Reference	-
	Overweight	1.358 (0.889–2.704)	0.157	0.533 (0.318–0.895)	0.017	0.539 (0.321–0.905)	0.019
	Normal weight	2.310 (1.566–3.408)	<0.001	0.399 (0.203–0.785)	0.008	0.402 (0.204–0.791)	0.008
	Underweight	5.064 (3.168–8.097)	<0.001	0.530 (0.202–1.389)	0.196	0.533 (0.203–1.399)	0.201
PBF	Q4	Reference	-	Reference	-	Reference	-
	Q3	0.511 (0.395–0.661)	<0.001	0.466 (0.342–0.636)	<0.001	0.466 (0.342–0.636)	<0.001
	Q2	0.606 (0.473–0.775)	<0.001	0.693 (0.490–0.980)	0.038	0.694 (0.490–0.982)	0.039
	Q1	0.629 (0.493–0.803)	<0.001	0.764 (0.500–1.168)	0.215	0.761 (0.498–1.163)	0.207
Osteoporosis
BMI	Obese	Reference	-	Reference	-	Reference	-
	Overweight	2.132 (0.471–9.661)	0.326	0.441 (0.079–2.454)	0.350	0.450 (0.081–2.499)	0.361
	Normal weight	3.427 (0.823–14.271)	0.091	0.126 (0.015–1.083)	0.059	0.124 (0.014–1.070)	0.058
	Underweight	16.523 (3.782–72.182)	<0.001	0.185 (0.012–2.915)	0.230	0.179 (0.011–2.823)	0.221
PBF	Q4	Reference	-	Reference	-	Reference	-
	Q3	0.561 (0.288–1.091)	0.088	0.555 (0.255–1.208)	0.138	0.562 (0.257–1.226)	0.148
	Q2	0.433 (0.211–0.888)	0.022	0.623 (0.248–1.564)	0.313	0.623 (0.247–1.573)	0.317
	Q1	0.709 (0.382–1.315)	0.275	1.109 (0.391–3.144)	0.846	1.122 (0.395–3.192)	0.829

^a Adjusted covariates:

Model 1 = age

Model 2 = Model 1 + proteinuria, TC, UA, Cr, AST, albumin, hsCRP, TSH

Model 3 = Model 2 + history of smoking, drinking