Misuse of Prescription Opioids in Past 12 Months at Follow-Ups 1 to 3 as a Function of 12th Grade Characteristics: Relative Risk Ratios and 95% CIs

VariableModel 1Model 2
Relative Risk95% CIRelative Risk95% CI
Legitimate use of prescription opioids by 12th grade1.33*1.04–1.7
Lifetime marijuana use occasions by 12th grade
 None (reference)
Cigarette smoking history by 12th grade
 Never (reference)
 Once or twice1.56**1.14–2.131.56**1.15–2.13
 Occasionally but not regularly1.75**1.26–2.421.73**1.25–2.4
 Regularly in the past2.09**1.41–3.112.08**1.4–3.09
 Regularly now1.78**1.25–2.521.78**1.26–2.52
Lifetime prescription opioids misuse occasions by 12th grade
 None (reference)
Lifetime misuse prescription barbiturates/sedatives occasions by 12th grade
 None (reference)
Binge drinking in last 2 wk
 None (reference)
Disapproval of regular marijuana use
 Don’t disapprove (reference)
 Strongly disapprove0.52**0.39–0.690.52**0.39–0.69
Average course marks in 12th grade0.94*0.89–0.990.95*0.9–1
Racial/ethnic minority0.61**0.47–0.790.62**0.48–0.8
Parent with college degree1.24*1.03–1.491.23*1.02–1.48
  • Variables that did not significantly contribute to this model include school truancy, no. evenings out per week, 2-parent household, age at survey, perceived risk of regular marijuana use, no. occasions misuse of prescription amphetamines and prescription tranquilizers, and no. occasions lifetime cocaine use. Model 2 adds to model 1 the 1 variable “legitimate use of prescription opioids by 12th grade.” CI, confidence interval. *P < .01; **P < .05.