TABLE 2

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)
 1–21.440.98–2.121.430.97–2.11
 3–51.310.83–2.081.310.83–2.08
 6–92.18**1.40–3.372.21**1.43–3.43
 10–192.73**1.87-3.992.74**1.88-3.99
 20–392.52**1.66–3.822.56**1.69–3.89
 40+2.83**2.02–3.962.92**2.09–4.08
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)
 1–22.21**1.59–3.071.97**1.4–2.77
 3–53.00**1.94–4.612.8**1.83–4.29
 6–93.36**2.17–5.203.2**2.06–4.96
 10–193.71**2.35–5.853.58**2.26–5.65
 20–396.07**3.3–11.175.88**3.19–10.8
 40+4.94**2.97–8.224.63**2.79–7.67
Lifetime misuse prescription barbiturates/sedatives occasions by 12th grade
 None (reference)
 1–21.63*1.00–2.641.63*1.01–2.65
 3–51.96**1.18–3.271.97**1.19–3.26
 6–91.50.82–2.761.570.85–2.89
 10–192.52*1.17–5.422.56*1.2–5.45
 20–392.86**1.57–5.212.93**1.61–5.33
 40+1.030.53–21.040.53–2.01
Binge drinking in last 2 wk
 None (reference)
 Once1.160.87–1.561.160.86–1.55
 Twice1.050.76–1.441.050.77–1.44
 3–51.44*1.05–1.961.44*1.06–1.97
 6–90.800.46–1.370.830.48–1.42
 10+0.870.43–1.740.860.42–1.74
Disapproval of regular marijuana use
 Don’t disapprove (reference)
 Disapprove0.72*0.56–0.930.72*0.56–0.93
 Strongly disapprove0.52**0.39–0.690.52**0.39–0.69
Women1.20.99–1.461.20.99–1.46
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
Constant0.03**0.02–0.040.03**0.02–0.04
  • 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.