. Author manuscript; available in PMC: 2019 Apr 1.

Published in final edited form as: Alcohol Clin Exp Res. 2018 Feb 27;42(4):781–794. doi: 10.1111/acer.13606

Table 4.

Within-subject Effect Sizes (Cohen’s d)

Measure	PFI		AO
Measure	1-month	9-month	1-month	9-month
Quantity	.57	.70	.47	.51
Frequency	.28	.74	.23	.41
HD days	.52	.75	.22	.38
Prop HD days	.54	.66	.19	.31
Peak drinks	.50	.57	.30	.44
Typical BAC	.46	.23	.17	.40
Problems	.28	.16	.10	.26

Note. PFI = personalized feedback intervention group, AO = assessment only group, Quantity = total number of drinks, Frequency = total number of drinking days, HD days = number of heavy drinking days, Prop HD days = proportion of heavy drinking days, Peak drinks = maximum number of drinks, Typical BAC = typical blood alcohol concentration, Problems = number of alcohol-related problems experienced.