Vitamin D deficiency is not only related to bone-related diseases but also associated with cardiovascular disease, diabetes, cancer and autoimmune diseases. Previous studies show that vitamin D deficiency increases risk of diabetic peripheral neuropathy (DPN). Data is limited among Chinese patients with type 2 diabetes. In this cross-sectional study, we enrolled 5362 patients (2359 men and 3003 women aged 30 to 89 years) with type 2 diabetes from Jan 1, 2016 to Oct 31, 2018. Serum 25-hydroxyvitamin D (25(OH)D) level was measured by electrochemiluminescence assay. Vitamin D deficiency was defined as Serum 25(OH)D level < 20 ng/mL according to the Endocrine Society Clinical Practice Guideline 2011. Diabetic peripheral neuropathy was diagnosed by motor/sensory nerve conduction velocity. Patients with diabetic peripheral neuropathy had lower serum 25(OH)D concentration (16.81±3.83 ng/mL vs. 18.05±4.11 ng/mL, P<0.05) compared with those without neuropathy. The prevalence of vitamin D deficiency was higher in patient with neuropathy than those without the complication (83.2% vs. 71.4%, P<0.05). We did not find gender difference on the prevalence of vitamin D deficiency. In the logistical regression model, Vitamin D deficiency was associated with increased risk of diabetic neuropathy, after adjustment of age, gender, duration of diabetes, smoking, body mass index, systolic blood pressure, fasting glucose, HbA1c, fasting C-peptide, total cholesterol, and microalbuminuria, the corresponding odds ratio was 1.76 (95% CI 1.05-3.37) (P<0.05). Vitamin D deficiency, a common hypovitaminosis in Chinese patients with type 2 diabetes, is independently associated with increased risk for diabetic peripheral neuropathy. Whether vitamin D supplementation improves diabetic peripheral neuropathy deserves further study.
L. Zhang: None. Y. Gu: None. Y. Yang: None. Y. Zhu: None. X. Yin: None. Y. Dong: None.