Table 2.

Substance use behaviors as a function of diversion source of nonmedical prescription opioids, 2007–2010

	Past-year drunkenness		Past-year marijuana use		Past-year illicit drug use other than marijuana		Past-year nonmedical use of other prescription medications
Diversion Source	%	Adjusted OR (95% CI)	%	Adjusted OR (95% CI)	%	Adjusted OR (95% CI)	%	Adjusted OR (95% CI)
Previous prescription only	68.1	--	7.7	--	10.7	--	23.8	--
Previous prescription + other sources	92.1	4.9 (1.6–15.0)**	35.8	6.1 (1.8–20.7)**	44.1	6.1 (2.1–18.0)***	75.1	10.5 (4.2–26.6)***
Other sources	88.8	3.2 (1.4–7.1)**	33.5	5.6 (1.8–17.4)**	52.4	8.3 (3.0–22.6)***	66.6	6.4 (2.9–14.0)***
Non-user	40.3	0.3 (0.1–0.6)***	4.0	0.4 (0.1–1.3)	3.9	0.3 (0.1–0.8)*	4.4	0.1 (<0.1–0.3)***
Chi-square (DF), p-value	237.8 (3), p < 0.001		423.2 (3), p < 0.001		855.7 (3), p < 0.001		1280.4 (3), p < 0.001

--The reference group is “Previous prescription only.”

Sample sizes for the regression models ranged from 7,857 (Past-year Drunkenness) to 8,442 (Past-year Marijuana Use) due to missing data.

Multivariate logistic regression adjusting for sex, cohort year, and school geographical region.

^*p < 0.05,

^**p < 0.01,

^***p < 0.001 based on logistic regression results.

Any past-year illicit drug use other than marijuana included LSD, psychedelics other than LSD, heroin, crack, and cocaine.

Any past-year nonmedical use of other prescription medications included stimulants, tranquilizers and sedatives.

Source: 2007–2010 MTF; weighted estimates with average design effect correction of 2.0 applied to chi-square statistics.