. Author manuscript; available in PMC: 2010 Jun 1.

Published in final edited form as: Drug Alcohol Depend. 2009 Mar 25;102(1-3):108–115. doi: 10.1016/j.drugalcdep.2009.02.005

Table 1.

Average Patient Outcomes During Treatment in each Treatment Arm^a

	Standard Treatment (N = 38)	Voucher CM (N = 53)	Prize CM (N = 50)
LDA during treatment	4.63 (3.4)	7.00 (4.2)^*	7.84 (4.3)^*
# of negative specimens during treatment	9.18 (5.9)	12.40 (6.3)^*	13.58 (5.8)^*

LDA = longest duration abstinent

Values represent means and standard deviations (in parentheses).

p-value < .05 (compared to standard treatment).