Heredity Although there were some negative evidence, but it is always said that genetic factors that affect the risk of depression. For example, McGuffin et al. (1996) found that 46% of identical twin pairs and depressed, while at the fraternal twins, the rate is 20%. Similarly, Wender et al. (1986) conducted a study on two groups as follows: The first group is a relative of the adopted children have grown up and been depressed. The second is the adoption group. The research was conducted on the basis of understanding the parameters of age, economic status - a period of social and people living with biological parents adopted without depression. Comparing rates of depression between the two groups, visitors can see that in the first group, many who suffer from depression and had 8 times the intended suicide more than 15 times, compared with their own intestines people This adoption. There was no difference between the groups when considering the degree of mild depression.
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