Most American teenagers — across demographic groups — see depression and anxiety as major problems among their peers, a new survey by the Pew Research Center found.

The survey found that 70 percent of teenagers saw mental health as a big issue. Fewer teenagers cited bullying, drug addiction or gangs as major problems; those from low-income households were more likely to do so.

The consistency of the responses about mental health issues across gender, race and income lines was striking, said Juliana Horowitz, an associate director of research at the center.

The survey also asked respondents if they considered alcohol consumption or teen pregnancy to be major problems among their peers. Half of the teenagers from households earning less than $30,000 said alcohol was a major problem; that number decreased to 43 percent among teenagers in households earning more than $75,000.