Table 1.

Characteristics of the study participants, N=396.

Participant Characteristics	n	(%)
Gender
Men	216	54.5%
Women	180	45.5%
Ethnicity
White	197	49.7%
African American	175	44.2%
Other	24	6.0%
Age
18-20	164	41.0%
21–23	236	59.0%
Opioid abuse (lifetime)	65	26.4%
Dependence criteria (lifetime)
0	120	30.3%
1	125	31.6%
2	102	25.8%
3 or more	49	22.4%
Most common method of pharm. opioid administration (past 6 months)
Oral	328	83.0%
Intranasal inhalation	66	16.7%
Other (excluding injection)	1	0.3%
Duration of illicit pharmaceutical opioid use in years, (Mean, Std.)	4.1 (2.07)
Frequency of illicit pharmaceutical opioid use in the past 6 months
Less than 1 day per month	9	2.3%
1-3 days per month	99	25.0%
1 day per week	67	16.9%
2 days per week	126	31.8%
3-5 days per week	95	24.0%
6-7 days per week	0	0
Average number of days used illicit pharmaceutical opioids in the past month (Mean, Std)	8.2 (6.3)
Average number of pharmaceutical opioid tablets used per day (Mean, Std)	2.2 (0.4)