Serum 25-Hydroxyvitamin D Levels in Type 2 Diabetes Patients in North China: Seasonality and the Association between Vitamin D Status and Glycosylated Hemoglobin Levels

Table 3

Correlations of 25(OH)D with various parameters.

Variable	r	value	Variable	r	value
Age (years)	0.030	0.329	FBG (mmol/L)	−0.031	0.314
Duration of DM (years)	0.032	0.294	OC (ng/ml)	−0.044	0.147
BMI (kg/m^2)	−0.068	0.026	β-CTX (ng/ml)	−0.034	0.260
SBP (mmHg)	−0.060	0.049	P1NP (ng/ml)	−0.092	0.003
DBP (mmHg)	−0.008	0.782	PTH (pg/ml)	−0.179	0.000
Albumin (g/L)	0.247	0.000	Ca (mmol/L)	0.108	0.000
TC (mmol/L)	0.001	0.976	P (mmol/L)	−0.051	0.093
TG (mmol/L)	−0.069	0.024	TT3 (nmom/L)	0.124	0.000
LDL-C (mmol/L)	0.021	0.486	TT4 (nmom/L)	0.110	0.000
HDL-C (mmol/L)	0.067	0.027	FT3 (pmom/L)	0.143	0.000
ApoA1 (g/L)	0.079	0.009	FT4 (pmom/L)	0.075	0.014
Apob (g/L)	0.017	0.587	TSH (μIU/mL)	0.009	0.766

BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure; TC, total cholesterol; TG, triglyceride; LDL-C, low-density lipoprotein cholesterol; HDL-C, high-density lipoprotein cholesterol; ApoA1, apolipoproteinA1; apob, apolipoprotein b; FBG: fasting blood glucose; OC, osteocalcin; β-CTX, β-C-terminal cross-linked telopeptide of type I collagen; P1NP, procollagen type 1 N-terminal propeptide; PTH, parathyroid hormone; Ca, calcium; P, phosphorus; TT3, triiodothyronine; TT4, tetraiodothyronine; FT3, free thyroxine; FT4, free tetraiodothyronine; TSH, thyroid-stimulating hormone. Bold values indicate statistically significant results.