When a bullet pierced the left side of 13-year-old DeAndre Knox’s head exactly five years ago on Friday, leaving the Indianapolis teen severely disabled, it shattered more lives than just his.

His 14-year-old brother Darrius still doesn’t feel safe in crowded environments, and fears venturing into the outside world. His mother, DeAndra Dycus, finds herself tied to her phone, worried today will be the day that the rehabilitation center that cares for the now 18-year-old Knox calls to say he never woke up, or that he took a turn for the worse.

Fifty-eight percent of American adults have experienced trauma related to gun violence in their lifetime, according to a report released on Friday by Everytown for Gun Safety, a non-profit for gun policy reform.

DeAndra Dycus and her son DeAndre Knox, 18. DeAndre was shot in the head at 13 years old, leaving him severely disabled. Photograph: The Guardian

More people are killed in the US with guns within the first month of the year than are killed in any of the nation’s high-income peer countries in an entire calendar year. Each year, more than 100,000 Americans survive a gunshot wound and 15,600 children and teens are shot and injured, the report states.

The violence doesn’t only alter the lives of the victims, but those of their entire network, the report stresses. “Gun violence in any form leaves an indelible mark on the lives of those who are affected,” said Christopher Kocher, director of the Everytown Survivor Network.

The financial burdens of caring for an injured loved one can be steep, the report notes. The average costs for a hospital admission ranged from $19,175 per handgun injury to $32,237 per assault weapon injury, the report notes. In addition to emergency hospital care, survivors of gunshot injuries face lifetime medical care costs, including readmission to the hospital and nursing care.

Though DeAndre’s stay at the rehabilitation center is covered by Medicare, Dycus still has to pay about $1,000 out of pocket each month. She also needs to consider miscellaneous costs, such as the $25,000 it would cost for her to buy a van with a wheelchair lift.

One study estimates that the value of wage and household work lost due to short or long-term disability in a gun victim’s recovery phase averages about $28,478 for each survivor. That estimate does not account for the productivity loss that comes with coping with the emotional fallout.

Then there is the psychological trauma, the depression, the anxiety and the post-traumatic stress disorder, all of which children exposed to violence are more likely to suffer from, according to the report.

DeAndre was an honor-roll student and an avid basketball and football player when he attended a friend’s birthday party in Indianapolis, Indiana, on 1 February 2014.

A argument broke out and, moments later, someone fired into the house 20 times. DeAndre was the only one struck. No arrest has ever been made.

DeAndre is a quadriplegic, and cannot talk. Dycus hopesher son may one day get the miracle he needs, but at the same time, she has to be pragmatic. She just went to court to be appointed his legal guardian for the rest of his life.

“All his friends are going off to college,” Dycus said. “You can’t help but think of the what-ifs. My son was a basketball player like his friends were. He wanted to go to IU.”

On the fifth anniversary of her son’s shooting, Dycus hopes to send a message about the survivors of gun violence, and the far-reaching effect their injuries have on their loved ones.

“Being a parent of an injured victim, I think it’s important that people see this side of gun violence. You hear on the news, ‘One person dead, three injured’, but you never stop and think about how people live with severe injuries. There is so much pain still.”