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A precipitous drop in the happiness, self-esteem and life satisfaction of American teenagers came as their ownership of smartphones rocketed from zero to 73 percent and they devoted an increasing share of their time online. Coincidence? New research suggests it is not. In a study published Monday in the journal Emotion, psychologists from San Diego State University and the University of Georgia used data on mood and media culled from roughly 1.1 million U.S. teens to figure out why a decades-long rise in happiness and satisfaction among U.S. teenagers suddenly shifted course in 2012 and declined sharply over the next four years.

In the new study, researchers tried to find it by plumbing a trove of eighth-, 10th- and 12th-graders’ responses to queries on how they felt about life and how they used their time. They found that between 1991 and 2016, adolescents who spent more time on electronic communication and screens — social media, texting, electronic games, the internet — were less happy, less satisfied with their lives and had lower self-esteem. TV watching, which declined over the nearly two decades they examined, was similarly linked to lower psychological well-being.

By contrast, adolescents who spent more time on non-screen activities had higher psychological well-being. They tended to profess greater happiness, higher self-esteem and more satisfaction with their lives. While these patterns emerged in the group as a whole, they were particularly clear among eighth- and 10th-graders, the authors found: “Every non-screen activity was correlated with greater happiness, and every screen activity was correlated with less happiness.”

Since 2000, our time spent online each week has steadily increased, rising from 9.4 hours to 23.6 hours — nearly an entire day, according to a recent report by the USC Annenberg Center for the Digital Future. The internet has become an integral component of our home lives as well, with time spent rising more than 400 percent over that period from 3.3 hours to 17.6 hours each week, according to the report, which surveys more than 2,000 people across the U.S. each year. The center’s 15th annual Digital Future Report illustrates the internet’s dramatic evolution since 2000 from a secondary medium to an indispensable component of our daily lives — always on and always with us. It also comes as many fear for the future of the unlimited internet we have largely taken for granted over the past two decades. The report also found that the internet has had a dramatic impact on how we get our news. News consumption for all ages went from a print-to-online ratio of 85-15 in 2001 to a near even 51-49 in 2016.