A large study links stricter screen rules with less use, and a smaller gap as teens get older.

What changed

On October 28, 2026, PLOS Digital Health published a study by Lopez, Lopez-Flores, Ruiz-Orozco, and Nagel. It uses the Adolescent Brain Cognitive Development (ABCD) Study. The authors kept adolescents who completed the year-3, year-4, and year-5 visits, then dropped seven who had no parent questionnaire at any of those visits. The analysis includes 8,089 adolescents. The included group was about 13 years old on average and skewed toward higher household income and more parental education. Parents answered 14 questions about media practices. The authors grouped those answers into low, moderate, and high restriction profiles. The profiles are patterns in the data, not a clinical label.

Youth reported an average of 4.74 hours of screen time a day across those years, excluding schoolwork: about 4.06 hours on weekdays and 6.43 hours on weekends. Compared with the low-restriction group, the high-restriction group reported about 56 fewer minutes a day (95% confidence interval −62.7 to −49). The moderate group reported about 11.5 fewer minutes a day (95% confidence interval −17.5 to −5.5).

The same direction showed up in other measures, with smaller samples:

• On self-reported smartphone time, at years 4 and 5, the high-restriction group averaged about 43.5 fewer minutes a day than the low-restriction group. Youth overall reported about 3 hours of smartphone time a day. Children without a smartphone, 9.8% at year 4, were not asked this question, and neither were children who reported zero total screen time.
• On Android phones measured by the study app, the high-restriction group averaged 79.3 fewer minutes a day. That passive measure included 986 participants at year 4 and 885 at year 5. Average use in that subset was 5.3 hours a day. The app could not record this duration on iPhone.
• Keyboard data, from Android keyboards and a third-party keyboard on iPhone, covered 2,846 participants at year 4 and 1,900 at year 5. The high-restriction group logged 286 fewer keystrokes a day. The paper’s interval for that difference runs from 145 to 427 fewer keystrokes.

The screen-time gap was not steady with age. The high-restriction group’s self-reported screen time rose faster as they got older, by about 13 minutes a day for each additional year of age (95% confidence interval 7.9 to 18.2). The authors read that as the association weakening as adolescents gain independence. A similar age pattern for self-reported smartphone time did not remain statistically significant after the authors’ correction for multiple tests. They found no significant age interaction for the passive Android measure or for keystrokes.

Parents also tended to loosen the rules. High restriction fell from 46.9% of the sample in year 3 (3,796) to 35.2% in year 4 (2,849) and 25.3% in year 5 (2,044). Low restriction rose from 14.4% (1,164) to 24.7% (1,998) and then 36.1% (2,919). The authors say downward shifts were more common than parents becoming stricter. About 21.5% stayed in the high-restriction group across all three years.

A separate model ranked individual parent answers against self-reported screen time. It explained about 10.2% of the variation. On the test data, the typical error was 128.4 minutes and the root-mean-square error was 176.9 minutes, so the ranking sits inside a weak prediction. Within that model, the strongest feature was a screen-based device playing in the room when the child falls asleep (normalized gain 0.23). Next was falling asleep while using a screen-based device (0.21). Limiting screen time on the weekend ranked lower (0.10), as did having a mobile device in bed (0.06). The authors call bedroom access an important correlate. They say removing devices from the bedroom is a question for future research. This paper did not test that change.

What the paper does not show

The authors are explicit about the limits:

• The findings are associations. Parents may set fewer restrictions when a child already uses screens less, rather than lower use being the result of fewer restrictions.
• High restriction was more common among parents with postgraduate degrees and in households with income of $100,000 or more. The models adjusted for income and education. The authors still say those factors may contribute to the differences.
• Data collection for the measures they discuss spanned January 2019 to January 2024. The authors say year-3 and year-4 visits were likely affected by pandemic stay-at-home orders, and that this may partly explain the shift in profiles.
• Keeping only adolescents who completed all three visits dropped 2,354 participants. The authors say the included and excluded groups did not differ significantly in self-reported screen time at year 3, and that the included group may not generalize to families with more intermittent participation or greater socioeconomic disadvantage.

What you can do

Use the paper as a check on a plan you already have. It did not test TenMore, Apple Screen Time, or any other product.

• If you use rules, keep them, and plan to revisit them. Stricter profiles lined up with less reported use, and the reported gap narrowed with age while many parents loosened the rules. A short family agreement can name the window. The habits page already says to adjust the plan as a child grows.
• Look at sleep and the bedroom, not only the daily total. In the authors’ ranking, a screen playing at sleep and falling asleep while using a device outranked the weekend limit. Where it is practical, the same habits page says to use a shared charging spot outside bedrooms and put devices away at bedtime. The paper does not show that moving the charger will produce a set number of minutes.
• Do not treat 56 minutes as a promise. That figure is the average difference between two parent-reported profiles, not the result of a program. The October 25 review of programs rated the evidence on reducing screen time as low confidence. This study does not replace that review, or the October 4 review of health and development associations. A schedule can still hold the time you agreed. Apple’s time controls are one way to do that on an iPhone or iPad.

Source

• Longitudinal patterns of digital parenting restrictions and adolescent screen useLopez, Lopez-Flores, Ruiz-Orozco, and Nagel, PLOS Digital Health, published October 28, 2026. The open-access paper is the source for the sample, the minute and keystroke differences, the age interaction, the shift in profiles, the bedroom ranking, and the limits above.