How much screen time affects children at school

Parents may have seen worrying headlines about a large new study on children's screen time. Researchers examined evidence covering more than 2.8 million children across 64 countries and found that greater digital and social media use was linked with less favourable outcomes in several areas, including overall school grades, language development and some emotional and behavioural measures.

The study is important because of its scale, but it needs careful reading. It found associations, not proof that screens cause poorer outcomes. The researchers described screen use as one potentially modifiable factor associated with children's wellbeing, while independent experts stressed that screen use alone cannot explain why a child may be struggling emotionally or academically.

What did the new screen time study actually find?

The research, published in JAMA Pediatrics and led by academics at the University of Calgary in Canada, was an umbrella review. That means the researchers brought together findings from previous large reviews rather than running a single new experiment with one group of children.

The review covered many kinds of devices and activities, including smartphones, televisions, social media scrolling, gaming and video calls. Across the evidence, longer periods of digital and social media use were associated with less favourable outcomes in several, although not all, areas of children's developmental health.

One of the findings likely to attract parents' attention was an association between greater screen exposure and lower overall grades at school. The study also found links between higher screen use and poorer language development.

Does more screen time cause lower grades?

No. The study found a relationship between greater screen exposure and lower overall grades, but an association is not the same thing as proof of cause and effect.

That distinction matters. Children who spend more time on screens may differ in many other ways from children who spend less time on them. A study can identify that two things tend to occur together without establishing that one directly produced the other.

For parents, this means the findings are better treated as something worth noticing than as a diagnosis of what is happening in one household. Screen habits may be one part of a much wider picture that also includes school, family life, relationships and other circumstances.

What did the study find about children's mental health?

Higher screen use was linked with emotional and peer problems. The researchers also found associations with internalising behaviour, a category that includes symptoms of depression and anxiety, and with externalising behaviour, including aggression and symptoms associated with attention deficit hyperactivity disorder.

The authors said the size of these associations was similar to, or larger than, effects reported for some other established predictors of children's outcomes, including socioeconomic status, parenting behaviour and premature birth. That comparison helps explain why the study attracted attention.

It still does not mean that screen use is the main reason a child experiences distress or behavioural difficulties. The findings describe patterns across very large groups of children. They cannot tell a parent why one particular child feels anxious, struggles with peers or finds it difficult to concentrate.

What did the study not find?

The results were not uniformly negative across every academic measure. When researchers looked at individual school subjects, they did not find a link between screen time and attainment in maths, reading or science.

That finding also needs to be interpreted cautiously. The authors said those subject-specific outcomes were among the least studied areas in the available evidence. The absence of a detected relationship could therefore reflect a shortage of research rather than firm evidence that screen time has no relationship with attainment in those subjects.

The wider picture is mixed rather than simple. The review linked greater screen exposure with lower grades overall and poorer language development, while not finding the same relationship in the individual areas of maths, reading and science.

What are experts saying about the screen time study?

The independent criticism is an important part of the story. Tatiana Iniguez Berrozpe, a senior lecturer in sociology at the University of Zaragoza, said the study showed an association between screen time and poorer mental health and academic performance, but described that association as small.

Her view was that the finding should not be dismissed, but neither should it be taken as evidence that screens are the main cause of adolescent emotional distress. She also stressed that screen use alone cannot explain why a teenager may be distressed or performing less well at school.

Esther van Sluijs, professor of behavioural epidemiology at Loughborough University, described the study as high quality but pointed to another limitation. The available evidence was not detailed enough to draw robust conclusions about particular types of screen use, such as gaming or social media, so broad findings about screen exposure should not automatically be applied to every kind of digital activity.

Does the type of screen use make a difference?

This study cannot give parents a confident answer. It included a wide range of devices and activities, from television and smartphones to gaming, social media and video calls, but there was not enough evidence to separate their effects reliably.

That is important because screen time is not one single activity. A video call, a game and time spent scrolling social media all involve a screen, but they are different experiences. This review does not provide enough evidence to say that one of those activities is responsible for a particular academic or emotional outcome.

For families, that suggests caution about treating every minute of screen use as identical. It may be more useful to look at what a child is doing, when they are doing it and whether it appears to be getting in the way of sleep, schoolwork, conversation or other parts of daily life.

What should parents take from the screen time headlines?

The clearest message is not that families need a dramatic reset. The researchers themselves described screen use as one potentially modifiable factor associated with children's wellbeing across several areas. That wording matters because it places screens among many influences rather than presenting them as the single explanation for a child's progress or emotional health.

Parents can use the study as a prompt to notice patterns. If screen use regularly crowds out homework, reading, sleep or time with other people, a small adjustment may be worth trying. If screens are not causing obvious difficulties, there is no reason to assume that a headline describes what is happening in your home.

No parent should read this research as a verdict on their household. It adds useful evidence to an ongoing discussion, but it cannot tell an individual family what caused a child's grades, mood or behaviour.

Some small, practical things parents can try this term:

• Try keeping one regular homework period a little more screen-light where practical.
• Ask your child which screen activities help them switch off and which leave them feeling drained.
• Notice whether screens are regularly pushing bedtime later than intended.
• Try moving a distracting device out of reach during one short study session.
• Look at screen habits alongside sleep, schoolwork, friendships and family routines rather than in isolation.
• Make one small change at a time and see whether it genuinely helps your child.

If you would like help turning study time into focused, productive sessions, our primary tutoring and secondary tutoring pages explain how one-to-one support works and what a typical week looks like.