Table 2.

Changes in readiness to change, alcohol use, and alcohol-related problems following a brief motivational intervention.

	Borsari & Carey, 2000 (N = 29)				Carey et al., 2006 (N = 138)				Murphy et al., 2004 (N = 54)
	R2	ΔR2	t	β	R2	ΔR2	t	β	R2	ΔR2	t	β
Readiness to Change (pre-post change)
	6 week follow-up				1-month follow-up				Post-session
Baseline RTCQ	.425	.425	5.60**	.540	.165	.165	−4.79*	−.380	.17	.	−3.18*	−.41
Group †	.503	.078	3.32**	.306	.170	.005	1.13	.089	.18	.01	0.77	.10
Gender††	.555	.042	2.52*	.241	.178	.008	−1.54	−.122	.18	0	0.05	.01
									6-month follow-up
Group									.0	0	−1.5	−.02
Gender									.02	.02	1.0	−.15
Pre-post session RTCQ									.09	.07	1.8	.26
Alcohol Use (drinks per week) at follow-up
	6 week follow-up				1-month follow-up				6-month follow-up
Baseline Drinking	.253	.253	3.88*	.488	.125	.125	3.33**	.285	.41	.41	5.82**	.64
Group	.322	.069	−2.08*	−.249	.141	.016	−1.41	−.113	.41	0	−.02	−.01
Gender	.330	.008	0.64	.080	.177	.036	−2.42*	−.203	.49	.08	−2.65**	−.30
Change in RTCQ†††	.330	.000	−0.57	.069	.182	.005	.89	.074	.51	.02	−1.41	−.15
Alcohol-related Problems at follow-up
	6 week follow-up				1-month follow-up				6-month follow-up
Baseline Problems	.418	.418	5.68**	.654	.394	.394	9.04**	.613	.34	.34	5.01**	.57
Group	.427	.009	.573	−.067	.403	.009	−1.50	−.102	.35	.01	−.4	−.05
Gender	.430	.003	.526	.071	.409	.006	−1.03	−.070	.35	0	.03	.01
Change in RTCQ†††	.426	−.004	−0.69	−.077	.414	.005	0.99	.067	.35	0	−.14	−.02

^*p < .05

^**p < .01;

^†group was coded −1 Control, 1 Brief Motivational Intervention;

^††gender was coded −1 male, 1 female;

^†††For Borsari & Carey (2000) and Carey et al. (2006), the change score was follow-up minus baseline RTCQ scores, while for Murphy et al. (2004) the change scores were baseline minus post-session RTCQ scores.