Compared to people with a normal A1c level of 5.0% to 5.5%, they found that:
- An A1c level of less than 5.0% means a 48% lower risk of diabetes and about the same risk of heart disease.
- An A1c level of 5.5% to 6.0% means an 86% higher risk of diabetes and a 23% higher risk of heart disease.
- An A1c level of 6.0% to 6.5% means a 4.5-fold higher risk of diabetes and a 78% higher risk of heart disease.
- An A1c level of 6.5% or more means a 16.5-fold higher risk of diabetes and a twofold higher risk of heart disease.