. Author manuscript; available in PMC: 2012 Jan 15.

Published in final edited form as: Drug Alcohol Depend. 2010 Sep 15;113(2-3):207–214. doi: 10.1016/j.drugalcdep.2010.08.004

Table 4.

Differences in the Relative Reinforcing Efficacy Metrics among Adolescents with No Nicotine Dependence (MFTQ = 0–2), Moderate Nicotine Dependence (MFTQ = 3–5) and Substantial Nicotine

	No Dependence (n = 38)		Moderate Dependence (n = 69)		Substantial Dependence (n = 29)		ANCOVA¹

Measure	Mean	SE	Mean	SE	Mean	SE	F(134)	η²
Intensity	17.03	2.36	22.97	2.03	25.45	2.48	2.81^†	.04
O_max	7.21	1.25	16.33	5.67	32.09	13.11	4.82^**	.07
Elasticity	.028	.004	.025	.006	.014	.003	2.10	.03
Breakpoint	6.95	2.10	8.11	2.88	13.89	5.46	2.54^‡	.04
P_max	2.87	.95	11.25	5.75	21.57	13.35	1.29	.02

Dependence (MFTQ = 6–9).

Note: ANCOVAs included socioeconomic status as a covariate.

^†

p = .06;

^‡

p = .08;

^**

p = .01