Quoting selectively from the article
Since 1996, there have been 16 multiple victim shootings in schools, or incidents involving 4 or more victims and at least 2 deaths by firearms, excluding the assailant. Of these, 8 are mass shootings, or incidents involving 4 or more deaths, excluding the assailant.
Four times the number of children were killed in schools in the early 1990s than today, Fox said. “There is not an epidemic of school shootings,” he said, adding that more kids are killed each year from pool drownings or bicycle accidents. There are around 55 million school children in the United States, and on average over the past 25 years, about 10 students per year were killed by gunfire at school, according to Fox and Fridel’s research.
After the Columbine High School shooting in 1999, schools across the country began holding active shooter drills in which they huddled together in a corner or hid under their desks. Such exercises—which may include someone walking around pretending to shoot students—can be very traumatic, Fridel said, and there is no evidence that they help protect students. “These measures just serve to alarm students and make them think it’s something that’s common,” she said.