The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies.
Developmental dyslexia, or specific reading disability, is a disorder in which children with normal intelligence and sensory abilities show learning deficits for reading.
The percentage of the population with developmental dyscalculia is estimated to be between 3-6 percent, or one in twenty individuals [2-4]. This is a similar percentage to that for dyslexia, and yet dyscalculia is very understudied and under-resourced in comparison. Unlike some other learning disabilities, dyscalculia is as likely to affect girls as boys. [1] L. Kosc, Developmental Dyscalculia, Journal of Learning Disabilities, vol. 7, pp. 164-77, 1974.