At what age did you get your first smartphone or tablet? The younger the age of getting the first smartphone, the worse the mental health,” report Jon Haidt and Zach Rausch. They cite a report by Sapien Labs, which surveys mental well-being around the world. The effect is strongest for young women.

Sapien researches how social and technological changes affect humans through its Global Mind Project, they write. Their mental health research has found a decline in well-being for younger generations, especially for women.

You can get a reading on your Mental Health Quotient (MHQ) and request access to the full dataset.