All GSHS surveys were approved in each country by both a national government administrative body and an institutional review board or ethics committee

Study approval was received from Institutional Review Boards (IRBs) of the primary research institution These findings must be interpreted in light of several limitations We excluded those with missing data for the primary exposure The data analysis had been planned in advance of the data gathering Data for the NHIS analyses were weighted using the final person weights Consistent with those of other studies, our findings show that This study is subject to certain limitations. Reductions in indoor tanning could be attributed to several factors. SUDAAN software, version 10.1 (RTI International), which accounts for weighted data and the complex sample design Student consent was assumed with the completion of the questionnaire. The IRB at the University of Massachusetts Medical School reviewed the protocol and exempted it from the full committee review The baseline data collection for this study did not require ethical approval. This study was exempt from institutional review board approval No further ethical approval was deemed necessary. Addressing school violence and bullying is essential in order to achieve the Sustainable Development Goals (SDGs)

The data analysis had been planned in advance of the data gatheringWe excluded those with missing data for the primary exposureThese findings must be interpreted in light of several limitationsStudy approval was received from Institutional Review Boards (IRBs) of the primary research institution