A major long-term study of thousands of elementary school children in Ontario has found a significant link between increased screen time in early childhood and lower scores on standardized tests for reading and mathematics. The research, which tracked children over a 15-year period, provides new, robust evidence detailing the persistent association between early digital media consumption and later academic outcomes, prompting calls from researchers for a greater focus on establishing healthy screen habits for young children.
The findings, published in the journal *JAMA Network Open*, draw a direct line from parent-reported screen habits before the age of eight to subsequent performance on provincial exams in grades three and six. For each additional hour of daily screen time recorded in a child’s early years, researchers found a 9% to 10% decrease in the odds of that student achieving a high standard in both reading and math. This statistical relationship remained consistent across the large cohort, suggesting that the impact of screen exposure on these core academic skills is a measurable and widespread phenomenon. However, the study found no similar negative association when it came to writing performance.
A Fifteen-Year Longitudinal Study
The investigation was a collaborative effort between the TARGet Kids! research network, co-led by scientists at The Hospital for Sick Children (SickKids) and St. Michael’s Hospital in Toronto, and Ontario’s Education Quality and Accountability Office (EQAO), the agency responsible for administering the province’s standardized tests. This unique partnership allowed researchers to link two distinct and valuable datasets: detailed health and lifestyle information collected from families over many years and the official academic records of their children. The study followed a cohort of 3,322 children across Ontario from 2008 to 2023, creating a rich repository of data that captures the evolving landscape of childhood in the digital age.
The methodology centered on screen time data reported by parents during their children’s routine check-ups in early childhood. This information provided a baseline of typical daily exposure to various forms of digital media, including television, computers, and handheld devices. The research team then connected this data to the children’s individual results on EQAO assessments in grade three for reading and math, and again in grade six for math. This longitudinal approach, tracking the same individuals over an extended period, is critical for understanding how early life experiences can shape later development and achievement, providing more compelling evidence than a simple one-time snapshot.
The Core Findings on Reading and Math
The central conclusion of the study is the consistent negative correlation between the quantity of screen time and performance in key academic areas. The data revealed that children with higher levels of screen exposure before age eight were demonstrably less likely to meet provincial standards in reading and mathematics years later. The effect size was notable, with every extra hour of daily viewing associated with a tangible decline in the probability of academic success. For example, grade three students in the study had an average of 1.6 hours of daily screen time, while grade six students averaged 1.8 hours. An extra hour on top of those averages was linked to a significant drop in test scores.
This association held true even after accounting for various socioeconomic factors, indicating that screen time is an independent variable influencing academic outcomes. The connection was most pronounced for television and digital media consumption, which includes content viewed on computers, tablets, and smartphones. Researchers suggest these findings are crucial for understanding the complex interplay between a child’s environment and their educational trajectory. The results build upon a growing body of work suggesting that how children spend their time, particularly in their formative years, has lasting consequences for cognitive development and school performance.
Subtleties Within the Data
Writing Skills Unaffected
In a curious and potentially significant finding, the researchers discovered that the negative association with screen time did not extend to writing skills. While reading and math scores showed a clear decline with increased screen exposure, writing achievement appeared to be insulated from this effect. The study did not explore the specific reasons for this discrepancy, but it opens up new avenues for future research. It may be that the cognitive processes involved in learning to write are different from those required for reading comprehension and mathematical reasoning, or that screen-based activities interfere less with the development of writing abilities. This detail highlights the complexity of the issue, suggesting that screen time does not have a uniform impact on all aspects of learning.
Gender and Gaming
The study also uncovered a specific interaction between gender and video game use. Among the small portion of the cohort whose parents reported any video game use—approximately 20%—female students who played video games were more likely to experience lower scores in grade three reading and math compared to their male counterparts. The reasons for this gender-based difference are not yet understood, and the researchers caution that more investigation is needed to explore this finding further, especially given the relatively low number of reported gamers in the sample. It could be related to the types of games played, the social context of gaming, or other underlying factors not captured in the current dataset.
Expert Perspectives and Potential Mechanisms
Researchers involved in the study offered potential explanations for the observed link. The study itself posited that high levels of screen time might alter the physical structure of a child’s developing brain, thereby affecting cognitive functions that are essential for acquiring memories and learning new information. Dr. Catherine Birken, a senior author of the study and a pediatrician at SickKids, emphasized the practical implications of the findings. She stated that since screen time is a daily reality for most families, its potential impact on academic outcomes underscores the urgent need to develop and test early interventions that can help families foster healthier screen habits.
Other experts not involved in the study agreed that the findings align with a broader body of research. Dr. Sachin Maharaj, a professor at the University of Ottawa, explained that excessive screen time can train a child’s attention in ways that make it more difficult to maintain focus for extended periods. This impairment in the ability to concentrate translates directly into the learning environment, where sustained focus is necessary for deep thinking and skill acquisition.
Future Directions and Implications
The research team acknowledged that their study demonstrates a strong correlation but does not prove direct causation. It is possible that other unmeasured factors contribute to both higher screen time and lower academic performance. To build on their work, the researchers plan to investigate more nuanced questions in the future. They intend to explore how different types of screen content and the context of viewing—such as whether a child is watching alone or with a parent—might alter the impact on educational outcomes. They also hope to incorporate other academic measures, including report card grades and attendance records, to paint an even more complete picture.
Ultimately, the study serves as a valuable resource for parents, educators, and policymakers. Dr. Jennifer Hove, the director of data and reporting at the EQAO, noted that linking health data with academic assessments deepens the collective understanding of the diverse factors that shape student success. This knowledge can empower families and schools to make more informed decisions. The research validates the daily struggles many parents face in managing technology and reinforces the importance of balancing digital entertainment with activities known to support development, such as reading, outdoor play, and social conversation.
