It is found more often in boys than in girls. A third type of dyslexia is referred to as secondary or developmental dyslexia and is felt to be caused by hormonal development during the early stages of fetal development.

它在男孩中比在女孩中更常见。第三种类型的阅读障碍被称为继发性或发育性阅读障碍，被认为是由胎儿发育早期的荷尔蒙发育引起的。