A report (www.oas.samhsa.gov) by the Office of Applied Studies for the Substance Abuse and Mental Health ServicesAdministration about factors that predict marijuana use stated, “Multiple logistic regression also confirmed that the risk of recent marijuana initiation increased with increasing age among youths aged 12 to 14, but the risk decreased with increasing age among those aged 15 to 25.”What does this suggest about the way that age appears in the model used?