On this page: About the National Data | Methodology | History
About the National Data
Data
Baseline: 6.7 percent of adolescents aged 12 to 17 years reported use of marijuana in the past 30 days in 2018
Target: 5.8 percent
Numerator
Number of adolescents aged 12 to 17 years who reported marijuana use in the past 30 days.
Denominator
Number of adolescents aged 12 to 17 years.
Target-setting method
Projection
Target-setting method details
Linear trend fitted using weighted least squares and a projection at the 25 percent prediction interval.
Target-setting method justification
Trend data were evaluated for this objective. Using historical data points, a trend line was fitted using weighted least squares, and the trend was projected into the next decade. This method was used because three or more comparable data points were available, the projected value was within the range of possible values, and a projection at the 25 percent prediction interval was selected because progress to further decrease marijuana use has slowed in recent years, but the trend was still moving in the right direction. A sharper decline may not be realistic.
Methodology
Methodology notes
Respondents are considered to have used marijuana or hashish if they report use of either substance in the past 30 days.
History
Comparable HP2020 objective
Retained, which includes core objectives that are continuing from Healthy People 2020 with no change in measurement.
1. Because Healthy People 2030 objectives have a desired direction (e.g., increase or decrease), the confidence level of a one-sided prediction interval can be used as an indication of how likely a target will be to achieve based on the historical data and fitted trend.
