Table 4.

Multiple stepwise regression analysis: independent factors associated with serum adipose differentiation-related protein in all subjects.

Independent factors	β	SE	β′	t	p
Age	0.036	0.004	0.417	8.108	0.033
WC	0.018	0.006	0.167	2.821	0.006
HOMA-IR	0.172	0.040	0.258	4.274	<0.001
TG	0.396	0.047	0.507	8.395	<0.001

In this model WC, total cholesterol and alanine aminotransferase (ALT) were also included as covariates, but they were not independently associated with adipose differentiation-related protein. Body mass index did not enter into the model due to its high multi-collinearity (variance inflation factor >5.0). ALT was log-transformed before analysis. p value <0.05 was considered significant.

β, unstandardized coefficient; β′, standardized coefficient; HOMA-IR, homeostasis model assessment of insulin resistance index; SE, standard error; TG, triglyceride; WC, waist circumference.