San Francisco, California - Preteens who spend too much time glued to their screens have higher odds of developing Obsessive Compulsive Disorder (OCD), a health study has found.

Their odds of developing OCD over a two-year period increased by 13% for every hour they played video games and by 11% for every hour they watched videos.

The data is according to a new study led by UC San Francisco (UCSF) researchers, published this week in the Journal of Adolescent Health.

The lead author of the study has warned parents excessive screen time can have a detrimental impact on preteens' mental health.

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"Children who spend excessive time playing video games report feeling the need to play more and more and being unable to stop despite trying," said Jason Nagata, MD, assistant professor of pediatrics at UCSF.

"Intrusive thoughts about video game content could develop into obsessions or compulsions."

He said watching videos can also make preteens want to compulsively view similar content. Algorithms and advertisements can exacerbate that behavior, he added.

OCD is a mental health condition involving recurrent and unwanted thoughts as well as repetitive behaviors a person feels driven to perform.

"Screen addictions are associated with compulsivity and loss of behavioral control, which are core symptoms of OCD," Nagata said.

Researchers asked 9,204 US preteens aged nine to 10 how much time they spent on different types of platforms.

The average was 3.9 hours per day. Use of screens for educational purposes was excluded. Two years later, 4.4% of preteens had developed new-onset OCD.

Video games and streaming videos were each connected to a higher risk of developing OCD.

Texting, video chatting, and social media did not link individually with OCD, but that may be because the preteens in the sample did not use them much, researchers said. Results may differ for older teens, they added.

In July, Nagata and his colleagues discovered excessive screen time was linked to disruptive behavior disorders in nine to 11-year-olds, with social media the biggest contributor.

In 2021, they found adolescent screen time had doubled during the pandemic.

"Although screen time can have important benefits such as education and increased socialization, parents should be aware of the potential risks, especially to mental health," said Nagata.

"Families can develop a media use plan which could include screen-free times including before bedtime."

It comes as a separate study warned parents that frequently giving young children mobile devices to soothe them could do more harm than good in the long run.

In another new study, some 422 parents, plus 422 children aged three to five, took part from August 2018 to January 2020, with the results published by JAMA Pediatrics this week.

The researchers from the University of Michigan in Ann Arbor wanted to know if giving children smartphones or tablets to calm them down would create long-term issues for their executive functioning and emotional reactivity.

The study explained that executive functioning encompasses "inhibitory control, working memory, and attention flexibility."

The paper found that, particularly in boys or young children with higher temperamental surgency, the frequent use of devices for calming should be avoided.

Surgency "reflects an individual’s disposition towards positive affect, approach, sociability, high-intensity pleasure, reward seeking, and a high activity level," according to the Encyclopaedia of Personality and Individual Differences.

The study concluded: "Although using videos, apps, or photographs on a device may be effective in distracting or assuaging a young child’s distress in the moment, the results of this study suggest that this practice may become a more frequent habit with more emotionally reactive children, and that this may worsen their emotion-regulation skills over time.

"Particularly for boys and children with more surgent temperaments, pediatric healthcare professionals may wish to encourage alternative methods and therapeutic supports for emotion regulation from an early age."