Clearly there is no relationship between ``when the child had a mobile phone'' and sleep / depression
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Are mobile phone ownership and age of acquisition associated with child adjustment? A 5‐year prospective study among low‐income Latinx children - Sun - Child Development - Wiley Online Library
https://doi.org/10.1111/cdev.13851
Age that kids acquire mobile phones not linked to well-being, says Stanford Medicine study | News Center | Stanford Medicine
https://med.stanford.edu/news/all-news/2022/11/children-mobile-phone-age.html
Research on the age at which children get mobile phones was conducted by a research team of Stanford University's Xiaoran Sun et al. The research team is tracking children's happiness when they get a mobile phone by studying a group of more than 250 children aged 7 to 11 years old for five years.
The average age at which a child first picked up a mobile phone was 11.6 years old, with a sharp increase in numbers between the ages of 10.7 and 12.5, with 50% of children picking up a mobile phone for the first time. This result suggests that in many households, the time considered to be 'the best timing for children to have a mobile phone' matched.
There is a previous study that concluded that ``mobile phones reduce the quality and performance of sleep,'' and there was another study that showed no association, but most of them did not conduct longitudinal studies . .
In the research by Sun et al., in addition to asking whether children have a mobile phone every year and whether it is a smartphone, they also asked them to fill out a questionnaire to evaluate symptoms of depression, and the child's grade level. I researched bedtime and wake-up time. In addition, the children wore accelerometers on their waists for one week, and a survey of sleep onset and sleep time was conducted every night.
The survey found that almost all children had a mobile phone by the age of 15, and 99% of them had a smartphone. Also, in an analysis of whether happiness differs depending on the age at which a child first got a mobile phone, the decrease in depression scores was lower for children who owned mobile phones than for children who did not own them. and that children without mobile phones slept slightly longer on non-school days, but these data were not statistically
In addition, the research team analyzed whether children's characteristics interacted with happiness and mobile phone ownership, revealing that boys were less likely to be depressed than girls.
From these results, it was not recognized that ``the possession of mobile phones had a positive or negative impact on children's well-being.'' It may be important to study whether to use it.'
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