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 4

Adjusted association between HbA1c and 25(OH)D.

	HbA1c Level
	B	95% CI	β	t	-value
25(OH)D
Model 1	−0.031	(−0.047, −0.014)	−0.108	−3.563	0.000
Model 2	−0.027	(−0.044, −0.010)	−0.094	−3.106	0.002
Model 3	−0.026	(−0.043, −0.008)	−0.091	−2.887	0.004

Notes. Data are expressed as partial regression coefficient (95% confidence interval). Model 1: crude model; model 2: adjusted for age, sex, BMI, and diabetes duration; model 3: additionally adjusted for albumin, SBP, TG, HDL-C, ApoA1, Ca, P, P1NP, PTH, TT3, TT4, FT3, and FT4. BMI, body mass index; SBP, systolic blood pressure; TG, triglyceride; HDL-C, high-density lipoprotein cholesterol; ApoA1, apolipoproteinA1; P1NP, procollagen type 1 N-terminal propeptide; PTH, parathyroid hormone; Ca, calcium; P, phosphorus; TT3, triiodothyronine; TT4, tetraiodothyronine; FT3, free thyroxine; FT4, free tetraiodothyronine. Bold values indicate statistically significant results.