Effect of mean HbA1c on the association of HbA1c variability and all-cause mortality in patients with type 2 diabetes.

Mean HbA1c contributed to the correlation between HbA1c variability and all-cause mortality. The risks associated with HbA1c variability and glycaemic control status were similar. The relationship between mean HbA1c and mortality presented a J-shaped distribution for both low and high HbA1c variability.