What percent of individuals with two low-risk versions of a gene involved in controlling levels of serotonin in the brain will experience major depression when exposed to many stressful events?

Seventeen percent of the individuals with two low-risk versions of a gene involved in controlling levels of serotonin in the brain will experience major depression when exposed to many stressful events. Further, 44% of the patients of major depression, have attacked other people, physically or verbally.