These values represent the percentage of students between 9th and 12th grade who report having seriously considered committing suicide in the 12 months before the survey.

The Youth Behavioral Risk Survey collects this information using a stratified multistage sampling to obtain a representative sample of students within 9th and 12th grade in public schools in the 50 states, District of Columbia and Puerto Rico. For more information about the methodology, access: https://www.cdc.gov/healthyyouth/data/yrbs/pdf/2017/ss6708.pdf

Sources:

Centers for Disease Control and Prevention (CDC). 1991-2017 High School Youth Risk Behavior Survey Data. Unintentional Injuries and Violence. Disponible en: http://nccd.cdc.gov/youthonline/