People with the third blood group have an increased risk of blood clots, Arteriosclerosis, Thrombosis, and Vascular Biology reported referring to a new study.

The study authors analyzed data from more than 400,000 people. The risk of thrombosis in the owners of the third blood group is 45% higher than in the owners of the first blood group. Moreover, people with the third blood group have a 55% higher risk of deep vein thrombosis.

Those with the second blood group also have a higher risk compared to those with the first. Their risks were 44% and 50% for venous thrombosis and deep vein thrombosis, respectively.