Which of the following has been associated with an increased probability of suicide attempts?

Question

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Low serotonin turnover has been consistently associated with an increased probability of suicide attempts. Serotonin is involved in regulating mood, and low levels of serotonin have been linked to impulsivity and aggression, which can increase the risk of suicide. High dopamine and GABA turnover have not been consistently associated with an increased risk of suicide. The role of substance-P in suicide is not well established.

Which of the Following Has Been Associated with an Increased