In agricultural tractors for example, as a general rule 40 to 50 percent of the value of the machine will be lost in the first quarter of the machine's life and by the halfway point of lifetime, from 70 to 75 percent of the value will be lost.
People with PTSD may feel constantly alert after the traumatic event. This is known as increased emotional arousal, and it can cause difficulty sleeping, outbursts of anger or irritability, and difficulty concentrating. They may find that they are constantly on guard and on the lookout for signs of danger.
PTSD is an anxiety disorder that results from you living through or witnessing a traumatic event in which your life or the lives of others were threatened. The exact causes of the condition are unknown, and the reason some people who experience trauma develop PTSD while others do not is not known either. Regardless, PTSD changes the way the body reacts to stress, including fundamental changes in the chemicals and hormones that communicate information in the nervous system.