https://www.selleckchem.com/pr....oducts/epz004777.htm
676). Results were moderate to good for self-reported number of breaks/hour while watching TV (ρ range for different periods 0.482 to 0.536) and moderate for self-reported number of breaks/hour in total screen time (ρ range for different periods 0.377 to 0.468). Poor concurrent validity was found for self-reported number of breaks/hour during other screen time activities (ρ range for different periods 0.157 to 0.274). Conclusions Only the questionnaire items about number of breaks at school and while watching TV appear to be acceptabl
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