Genetic factorsAlthough there have been a number of negative evidence, but it has always been said that genetic factors can affect the risk of depression. For example, McGuffin and cs. (1996) found out that 46% of the twins of the same eggs along with depression, while other twins in the egg, this ratio is 20%. Similarly, Wender and cs. (1986) conducted a study on the 2 groups: the first Group of people who adopted children have grown and been suffering from depression. The second is the group. The research was conducted on the basis of understanding the parameters of age, socio-economic status and about the time the people who adopted children live with the mother not being depressed. Compare the ratio of depression between the two groups, found that in the first, customers could groups the proportion suffering from depression much folded eight times and there have been more suicide 15 times, compared with their bowels of this adoption. See no difference between the groups when considering the level of mild depression.
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