. Author manuscript; available in PMC: 2013 Jul 1.

Published in final edited form as: Addict Behav. 2012 Mar 16;37(7):817–823. doi: 10.1016/j.addbeh.2012.03.011

Table 3.

Effects of MI and BA on Adolescent Proximal Outcomes

	Baseline		1M FU
	M	SD	M	SD
Motivation to Quit^a
MI	4.12	1.03	4.12	1.11
BA	4.07	1.06	4.15	1.12
Quitting Self-Efficacy^a
MI	2.31	1.30	2.67	1.38
BA	2.50	1.44	2.53	1.20
Perceived Adolescent Smoking Rate^b
MI	58.68	21.45	32.15	19.55
BA	57.74	18.51	53.79	19.13
Perceived Adult Smoking Rate^b
MI	60.74	20.94	42.92	21.32
BA	59.24	19.13	57.53	20.17

Notes. All measures based on adolescent participant self-report. MI=Enhanced MI; BA=Brief Advice.

No significant effects of group, time or group × time.

Significant group × time effects (p < .001). MI decreased from baseline to 1M FU (1-month follow up) while BA did not change from baseline to follow up.