INS and diabetes mellitus: Adjusted for age, gender, BMI, diabetes duration, baseline high‐ and low‐density lipoprotein cholesterol, triglyceride, albumin‐to‐creatinine ratio, baseline use of oral glucose‐lowering agents, baseline use of insulin, mean hemoglobin A1c or fast plasma glucose during the first 24 months, history of major macrovascular diseases, history of major microvascular diseases, and smoking status