Research by Rachel Narr and colleagues at the University of Virginia looked at whether the quality of friendships during adolescence can predict aspects of long-term mental and emotional health.

The study looked at a sample of 169 teenagers over 10 years, from age 15 to 25. They were surveyed annually and asked about who their closest friends were along with questions about those friendships. They were also assessed on anxiety, social acceptance, self-worth and symptoms of depression.

The researchers found that teens who prioritised close friendships at age 15 had lower social anxiety, an increased sense of self-worth and fewer symptoms of depression at age 25 than their peers. However, teens who had lots of friends, rather than a few close friendships, had higher levels of anxiety as young adults.

The study also determined that there was a low relation between teens having high-quality friendships and being more sought after by their peers, suggesting that although some teens manage both popularity and close friendship well, and attract both due to similar characteristics, for the most part, these two types of social success are due to different personal attributes.

Source: Narr, R. K., Allen, J. P., Tan, J. S., & Loeb, E. L. (2017). Close Friendship Strength and Broader Peer Group Desirability as Differential Predictors of Adult Mental Health. Child Development. Advance online publication.