The implementation of state laws legalizing same-sex marriage was associated with a significant reduction in the rate of suicide attempts among high school students – and an even greater reduction among gay, lesbian and bisexual adolescents.

The Johns Hopkins Bloomberg School of Public Health researchers estimate that state-level, same-sex marriage policies were associated with more than 134,000 fewer adolescent suicide attempts per year. The study compared states that passed laws allowing same-sex marriage through Jan. 2015 to states that did not enact state-level legalization. A Supreme Court decision made same-sex marriage federal law in June of 2015.

"These are high school students so they aren't getting married any time soon, for the most part," says study leader Julia Raifman, a post-doctoral fellow in the Department of Epidemiology at the Bloomberg School. "Still, permitting same-sex marriage reduces structural stigma associated with sexual orientation. There may be something about having equal rights – even if they have no immediate plans to take advantage of them – that makes students feel less stigmatized and more hopeful for the future."

Suicide is the second most common cause of death among people ages 15 to 24 in the United States. Suicide rates have been rising in the U.S., and data indicate that rates of suicide attempts requiring medical attention among adolescents increased 47% between 2009 and 2015. Gay, lesbian and bisexual high school students are at particular risk.

For the study, Raifman and her colleagues analyzed data from the Youth Risk Behavior Surveillance System, a survey supported by the Centers for Disease Control and Prevention. The data included 32 of the 35 states that enacted same-sex marriage policies between Jan. 1, 2004 and Jan. 1, 2015. The researchers used data from Jan. 1, 1999 to Dec. 31, 2015 to capture trends in suicide attempts five years before the first same-sex marriage policy went into effect in Massachusetts. They were also able to compare data with states that did not enact same-sex marriage laws. They conducted state-by-state analyses, comparing, for example, suicide attempt rates in a state like Massachusetts before same-sex marriage was legalized to the period right after.

State same-sex marriage legalization policies were associated with a seven percent reduction in suicide attempts among high school students generally. The association was concentrated in sexual minorities, with a 14 percent reduction in suicide attempts among gay, lesbian and bisexual adolescents. The effects persisted for at least two years. The states that did not implement same-sex marriage saw no reduction in suicide attempts among high school students.

It's unclear whether the political campaigns surrounding same-sex marriage legalization were behind the reduction in suicide attempts or the laws themselves. Still, they found that the reduction in suicide attempts wasn't realized until after a law was enacted. In a state that would go on to pass a law two years in the future – when there was likely to be much conversation in the public about it – suicide attempts remained flat before passage.

While Raifman found that legalizing same-sex marriage appears to be positively associated with reducing suicide attempts, policies that take away rights or add to stigma could have the opposite effect.

"We can all agree that reducing adolescent suicide attempts is a good thing, regardless of our political views," Raifman says. "Policymakers need to be aware that policies on sexual minority rights can have a real effect on the mental health of adolescents. The policies at the top can dictate in ways both positive and negative what happens further down."

(Source: Johns Hopkins University Bloomberg School of Public Health)

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