The study was not considered human research

The study was not considered human research according to the review policy of the Research Institute at Nationwide Children’s Hospital institutional review board because all data were deidentified and publicly available.
出处:Trends in Suicide Among Youth Aged 10 to 19 Years in the United States, 1975 to 2016
JAMA Netw Open. 2019;2(5):e193886. doi:10.1001/jamanetworkopen.2019.3886



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If your research involves the use of existing data collected from human participants (e.g., secondary datasets, existing biological samples), but there are no identifiers linking human participants to the data/samples themselves, then the activity may not require IRB review and may be considered "not human participant research".

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Additionally, use of existing de-identified or publicly available datasets may not
  be considered human subject research. For more information, see the following document:   Secondary Analysis of Public Use Datasets.