A closer look: How many Newtown-like school shootings since Sandy Hook?

(CNN) — After Tuesday’s shooting at an Oregon high school, many media outlets, including CNN, reported that there have been 74 school shootings in the past 18 months.

That’s the time period since the December 2012 massacre at Sandy Hook Elementary School in Newtown, Connecticut, where 20 children and six adults were shot to death.

The statistic came from a group called Everytown for Gun Safety, an umbrella group started by former New York Mayor Michael Bloomberg, a passionate and public advocate of gun control.

Without a doubt, that number is startling.

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