Figure 1.

Trajectories of nonmedical prescription opioid use and heroin use between ages 18 and 50 from a latent profile analysis (n=444)

Notes: All percentages use attrition weights at age 50. All 95% confidence intervals are based on standard errors using Taylor series linearization. Response scales for past-year nonmedical prescription opioid use and heroin use ranged from (0) No occasions to (6) 40 or more occasions. NMPO = nonmedical prescription opioid. NMPO Use and Heroin Use among the Full Sample: No use (i.e., no NMPO use or heroin use), 83.2% (n=18252); NMPO use only, 15.1% (n=4993); Heroin use only, 0.5% (n=127); Both NMPO and heroin use, 1.2% (n=444).