. Author manuscript; available in PMC: 2023 Feb 26.

Published in final edited form as: Alcohol Clin Exp Res. 2022 Oct 4;46(11):2110–2120. doi: 10.1111/acer.14946

TABLE 3.

Effect of co-use on rate

Predictors	Model 1a: Peak hour rate			Model 1b: Daily rate
Predictors	ß	CI	p	ß	CI	p
Co-use	0.14	0.01 – 0.27	0.038	−0.02	−0.08 – 0.04	0.553

School (A)^a	0.06	−0.08 – 0.21	0.398	0.06	−0.02 – 0.14	0.140

School (B)^a	−0.09	−0.23 – 0.06	0.229	−0.04	−0.12 – 0.04	0.344

Male^a	0.04	−0.07 – 0.16	0.455	0.01	−0.06 – 0.08	0.745

Age 21^a	−0.26	−0.38 – −0.14	<0.001	−0.19	−0.26 – −0.12	<0.001

Non-white^a	0.04	−0.11 – 0.18	0.626	0.03	−0.06 – 0.11	0.542

Hispanic/Latinx^a	0.12	−0.09 – 0.33	0.272	0.05	−0.07 – 0.17	0.393

Weekend	0.33	0.23 – 0.42	<0.001	0.04	−0.00 – 0.08	0.070

Other drug use	−0.01	−0.21 – 0.19	0.895	−0.06	−0.16 – 0.03	0.198

After 4:00 pm drink start time	0.07	−0.05 – 0.19	0.255	0.20	0.14 – 0.25	<0.001

Liquor	0.74	0.65 – 0.84	<0.001	0.24	0.20 – 0.29	<0.001

# Drinks^a	0.29	0.27 – 0.32	<0.001	0.11	0.10 – 0.13	<0.001

Proportion of co-use days^a	−0.08	−0.28 – 0.13	0.478	0.04	−0.07 – 0.15	0.507

Note: N = 318 participants, 3110 daily observations. Statistically significant effects (p < 0.05) are in bold typeface.

Between-person variable. Peak hour rate = number of drinks consumed in the peak hour of drinking; Daily rate = total number of drinks consumed in a day divided by hours spent drinking; # Drinks = average total number of drinks per drinking day.