Figure 1. Prevalene of Prescription Drug Use 2012–2017.

Black filled shapes denote prevelance rates of substance misuse each year of the NSDUH survey from 2012 to 2017. Squares indicate prevelance rates or predicted prevalence rates using the restrictive definition of misuse (i.e., 2012–14 definition). Triangles indicate prevelance rates using the broad definition (i.e., 2015–17 definition). The white filled squares are prevelance rates that have been predicted using parameters from the segmented logistic regressions for each substance respectively. These estimates represent the predicted prevelance rates for each substance for 2015 with the restrictive definition. These estimates represent the predicted 2015 prevelance rates as if there was no definition change. Error bars are two times the standard error to increase visibility. The standard errors for the sedative estimates were too small to be plotted.