Table 3.

Multivariable linear regression analysis of independent variables affecting serum testosterone levels (nmol/L), n = 256

	Model 1 a		Model 2 b		Model 3 c
	β (95% CI)	P	β (95% CI)	P	β (95% CI)	P
Age (years)	0.01 (−0.02, 0.03)	0.63	0.00 (− 0.02, 0.03)	0.78	0.01 (− 0.03, 0.04)	0.78
BMI (kg/m2)	− 0.11 (− 0.18, − 0.05)	<  0.001	− 0.11 (− 0.18, − 0.05)	<  0.001	− 0.11 (− 0.19, − 0.04)	0.004
FBG (mmol/L)	−0.15 (− 0.32, 0.01)	0.07	−0.09 (− 0.26, 0.08)	0.30	−0.21 (− 0.53, 0.11)	0.20
TG (mmol/L)	−0.49 (− 0.68, − 0.30)	<  0.001	−0.42 (− 0.61, − 0.22)	<  0.001	−0.51 (− 0.77, − 0.24)	<  0.001
TC (mmol/L)	−0.12 (− 0.34, 0.09)	0.25	−0.07 (− 0.28, 0.14)	0.50	−0.14 (− 0.42, 0.13)	0.31
HDL-C (mmol/L)	0.69 (0.00, 1.37)	0.05	0.36 (−0.34, 1.06)	0.31	0.53 (−0.29, 1.35)	0.20
LDL-C (mmol/L)	0.04 (−0.21, 0.28)	0.77	0.09 (−0.15, 0.32)	0.48	−0.02 (− 0.34, 0.31)	0.93
TC/HDL-C ratio	−0.36 (− 0.59, − 0.13)	0.002	−0.23 (− 0.48, 0.01)	0.06	−0.42 (− 0.75, − 0.08)	0.014
BUN (mmol/L)	−0.08 (− 0.25, 0.10)	0.38	−0.07 (− 0.24, 0.10)	0.40	0.01(− 0.19, 0.21)	0.92
Creatinine (μmol/L)	−0.03 (− 0.04, − 0.01)	0.015	−0.02 (− 0.04, 0.00)	0.049	−0.02 (− 0.04, 0.01)	0.13
eGFR (mL/min/1.73 m2)
T3	Ref		Ref		Ref
T2	−0.72(− 1.18, − 0.26)	0.002	− 0.62 (− 1.08, − 0.17)	0.007	−0.88 (− 1.43, − 0.33)	0.002
T1	− 0.94 (− 1.44, − 0.44)	0.001	−0.81 (− 1.31, − 0.31)	0.002	−0.80 (− 1.40, − 0.20)	0.010

BMI body mass index, FBG fasting blood glucose, TG triglycerides, TC total cholesterol, HDL-C high density lipoprotein-cholesterol, LDL-C low density lipoprotein-cholesterol, TC/HDL-C total cholesterol-to-high density lipoprotein-cholesterol, BUN blood urea nitrogen, eGFR estimated glomerular filtration rate

^a Model 1: adjusted for age

^b Model 2: adjusted for age and BMI

^c Model 3: adjusted for model 2 and for education level, marital status, family income, smoking, drinking alcohol, sleeping, physical activity, cardiovascular disease, hypertension, diabetes, and CRP levels