مقایسه ویژگی‌های زیستی والدین خویشاوند و غیرخویشاوند با بیش از یک فرزند استثنایی در مناطق شهری و روستایی اهواز

This study aims at identifying factors influencing the birth of exceptional children in families who have more than one exceptional child. It investigates and compares the biological characteristics of the parents with more than one exceptional child, in two groups: a) parents from the same family background either from mother of father side b) parents from different family background or parents who are not relative. This study also compares the demographic characteristics of children in these two groups. This study focuses on 94 parents 58 of which form the Target group and 36 form the comparison group. Finding showed that there are significant differences in several biological characteristics variables in the two groups under study. These variables are parents' type of marriage, parents' relationship in terms of their family background, the mother's age, the father's age, mother's marriage age in both groups.