Figure 4.

Kaplan–Meier survival analysis of age at onset of substance use disorder by Block 5 Iowa Gambling Test performance: Individuals who performed disadvantageously (net score < 50; n = 54) on Block 5 of the Iowa Gambling Test had significantly earlier ages at substance use disorder onset than those who performed advantageously (net score ≥ 50; n = 54). This effect remained significant after accounting for familial risk status. The effect of Block 5 performance is most prominent for those experiencing early-onset SUD.