Everytown for Gun safety, an anti-gun group formed by former New York City Mayor Michael Bloomberg and prominent gun control advocate Shannon Watts, released new data on Tuesday suggesting that there have been an average of 1.37 school shootings every single week in the U.S. since the deadly 2012 shooting at Sandy Hook Elementary in Newtown, Connecticut.

The anti-gun organization cites a total of 74 school shootings since Dec. 14, 2012. However, several of the shootings have come under scrutiny as some of them appear to have occurred off-campus and at least one may have been an instance of self-defense.

Journalist Charles C. Johnson dug deeper into Everytown’s data on Tuesday and published his findings on Twitter. He also criticized the fact that the group classified violent disputes and gang-related violence as “school shootings.”

“It’s not a school shooting when someone goes and shoots a specific person on campus. It’s a shooting that happens to take place at school,” he wrote.

Take a look at Johnson’s findings:

You can cross-reference the news reports with Everytown for Gun Safety’s list here.

Do you think these shootings should still be classified as “school shootings?”