If your child is what we like to call an “iPad kid,” you might want to consider limiting their screen time.

A new study suggests children with more screen time, especially on mobile devices, show increased levels of stress and depression as teenagers.

Researchers from Finland followed 504 children for eight years from elementary school into adolescence. They used questionnaires and wearable devices to collect data on physical activity and screen time three times during the study: at the beginning, two years in and at the end. The researchers also used the Baltic Sea Diet measurement tool to assess the quality of participants’ diets.

By the study’s end, 187 teens had complete data on self-reported lifestyle behaviors. They answered the Cohen Perceived Stress Scale and the Beck Depression Inventory — two assessments that evaluate mental health.

Results showed those who reported greater screen time as a child were more susceptible to mental health problems later. Mobile device use had the strongest link to increased levels of stress and depression, but computer use also had a negative impact on stress.

And those with higher self-reported physical activity had better mental health outcomes, while those with less physical activity and more screen time saw the highest levels of stress and depression.

Interestingly, neither diet nor sleep quality had a significant impact on mental health. Boys benefited from physical activity more than girls, at least in terms of stress.

It can be tempting to give your child a phone to get them out of your hair. But next time, it might be best to send them outside — for your child’s sake, and yours.