عنوان مقاله [English]
This study aimed at evaluating the combination of blood groups of children and parents of adolescents with Down syndrome and comparison with parents with normal children, to evaluate the relationship between these variables on the frequency of Down syndrome was conducted in Tehran.To determine the type of blood group of parents, with the relevant licensing organizations and managers working in schools and exceptional education centers (slow step), step slow all schools in Tehran were studied. Slow steps in schools, all parents of students with Down syndrome through invitations to schools and 640 people were invited from parents of children with Down syndrome using sampling, the ABO blood group detection scheme voluntarily participated. Compared to normal samples, with the cooperation of Tehran Blood Transfusion Organization of normal blood group distribution index in Tehran in 1386, was used as control.Research tools, blood group card (BLUTYPE TM), was used to detect blood group A, B, and O.Research data using descriptive statistics (frequency and frequency) and inferential (chi-square), were analyzed.The results indicate that between blood group types of mothers, fathers and parents of blood group combination of children with Down syndrome and their children suffering Down syndrome, there is a significant relationship.Therefore, according to the study results between blood group types of mothers, fathers and parents of blood group combination of children with Down syndrome and normal difference there. -O blood group distribution in mothers of children with Down syndrome compared with normal mothers is higher. The frequency of blood group combinations Mather and father(O- & O) and (O- & O-), is higher and many more combinations of blood Mather and father (O & O), (O & A) & (O & B), is less.