Read the information at the following sites:
https://www.ojjdp.gov/pubs/239082.pdf
https://www.ojjdp.gov/ojstatbb/njcda/pdf/jcs2010.pdf pages 81-85. But you can look at other information on the site if you are interested.
ASSIGNMENT
Summarize (NOT COPY) and do an analysis of the information you read on the two sites listed above.