Table 2.

Mean scores across time on TLFB and DrInC variables.

Variable	Baseline M (SD)	6-Week Follow-Up M (SD)	6-Month Follow-Up M (SD)	Within Groups Effect Size (d) 6-Week	Within Groups Effect Size (d) 6-Month
TLFB Variables
Mean Drinks Per Week
MI	14.51 (17.13)	9.53 (11.53)	8.78 (11.63)	.34	.39
FO	19.96 (25.33)	11.26 (11.38)	9.34 (10.34)	.44	.55
Mean Drinking Days Per Week
MI	2.40 (1.89)	1.76 (1.80)	1.97 (2.19)	.35	.21
FO	2.84 (2.33)	2.05 (1.70)	2.15 (2.03)	.39	.32
Past month binge days
MI	4.54 (6.08)	3.72 (5.46)	2.97 (5.26)	.14	.28
FO	6.85 (8.77)	3.91 (4.66)	2.77 (4.05)	.42	.60
Drinks Per Drinking Day
MI	5.74 (3.28)	5.14 (3.73)	4.16 (2.37)	.17	.55
FO	6.44 (4.18)	5.84 (3.74)	5.13 (3.24)	.15	.35
DrInC Variables
Recent Consequences
MI	6.89 (6.16)	5.78 (7.61)	4.83 (7.19)	.16	.31
FO	8.33 (7.21)	7.81 (7.63)	5.26 (6.94)	.07	.43
Physical
MI	1.71 (1.56)	1.53 (1.74)	1.24 (1.72)	.11	.29
FO	2.03 (1.69)	1.65 (1.82)	1.23 (1.45)	.22	.51
Interpersonal
MI	1.46 (1.40)	1.06 (1.95)	1.14 (1.85)	.24	.20
FO	1.70 (1.81)	1.87 (2.05)	1.16 (2.07)	−.09	.28
Intrapersonal
MI	1.14 (1.65)	.94 (1.63)	.83 (1.61)	.12	.19
FO	1.42 (1.98)	1.48 (2.03)	.90 (1.92)	−.03	.27
Social Responsibility
MI	.69 (.96)	.34 (.83)	.62 (1.37)	.39	.06
FO	.88 (1.34)	.68 (1.17)	.52 (1.36)	.16	.27
Impulse Control
MI	1.89 (1.88)	1.81 (2.10)	1.21 (2.11)	.04	.34
FO	2.24 (1.90)	2.10 (2.02)	1.81 (2.43)	.07	.20

Note: Means and standard deviations are based on values with outliers corrected. MI = Brief motivational interview. FO = Feedback only. Baseline sample sizes were MI (N = 35) and FO (N = 33). Drinks per drinking day variable was only computed for participants who reported any past month drinking, resulting in a smaller baseline sample size of MI (N = 33) and FO (N = 31). Sample sizes vary slightly at follow-up time points due to missing data.