Table 3.

Association between Narcology Dispensary registration and surrogate consumption among cases and controls

	Cases narcology registration		Controls narcology registration
Surrogate consumption	No	Yes	No	Yes
No	904	84	1,549	41
Yes	518	199	110	25
Don't know/difficult to answer	36	9	20	5
Chi-square*	111.14		97.78
p value	<0.001		<0.001

*chi-squared test for a general association between reported surrogate consumption and registration at the Narcology Dispensary