MOESM1 of Prevalence of problematic smartphone usage and associated mental health outcomes amongst children and young people: a systematic review, meta-analysis and GRADE of the evidence

Additional file 1: Table S1. Main Search Strategy (from 01/01/2011 to 17/10/2017). Table S2. Characteristics of included studies. Table S3. Quality assessment of included studies using the Newcastle-Ottawa Scale. Table S4. Definitions and Problematic Smartphone Usage terms used, by included studies. Table S5. Mapping the instruments used to assess Problematic Smartphone Usage (PSU) onto criteria for behavioural addiction. Table S6. Summary of the results of the included studies.