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Independent samples t tests (2-tailed) were used to examine differences between participants who completed the protocol and those who dropped out. Root mean square errors (RMSEs) were calculated to examine the agreement between parent-reported mobile phone use and objectively measured mobile phone use.
JMIR Form Res 2022;6(9):e40572
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Two-tailed independent sample t tests will be used to examine the differences between those who withdraw from the study and those who complete the protocol.
A sample size of 100 is adequate to evaluate the feasibility of the multibehavior protocol to measure digital media use and screen time context among preschoolers and their families, allowing for generalization to other families with children of similar age and demographics. Given that this is a pilot study, no power analysis is required [67].
JMIR Res Protoc 2022;11(9):e36240
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