Table 2.

Intervention group differences on outcome variables by genotype

Variables	Number	U	z	p	θ	θ CI
Participant satisfaction
Informative
ALDH2*1/*1	96	259	−6.79	<0.001	0.89	0.80–0.94
ALDH2*1/*2	72	228	−4.82	<0.001	0.82	0.70–0.90
ALDH2*2/*2	21	22.5	−2.35	0.019	0.80	0.54–0.92
Interesting
ALDH2*1/*1	96	273	−6.66	<0.001	0.88	0.79–0.93
ALDH2*1/*2	72	300	−4.00	<0.001	0.77	0.64–0.86
ALDH2*2/*2	21	17	−2.74	0.006	0.85	0.60–0.95
Engaging
ALDH2*1/*1	96	262	−6.63	<0.001	0.89	0.80–0.94
ALDH2*1/*2	72	298	−4.00	<0.001	0.77	0.64–0.86
ALDH2*2/*2	21	13.5	−2.97	0.003	0.88	0.64–0.96
Useful
ALDH2*1/*1	96	131	−7.58	<0.001	0.94	0.87–0.98
ALDH2*1/*2	72	226	−4.81	<0.001	0.83	0.71–0.99
ALDH2*2/*2	21	10.5	−3.19	0.001	0.90	0.67–0.98
Fear arousal
ALDH2*1/*1	96	699	−3.72	<0.001	0.70	0.58–0.79
Intentions to reduce drinking
ALDH2*1/*1	90	563	−3.70	<0.001	0.72	0.61–0.81
Risk perception
ALDH2*1/*1	93	820.5	−2.22	0.026	0.62	0.50–0.72
ALDH2*1/*2	72	395	−3.38	<0.001	0.70	0.56–0.80
Alcohol expectancies
Evaluation of positive expectancies
ALDH2*1/*2	65	340.5	2.50	0.013	0.68	0.54–0.79
Alcohol use outcomes
Peak quantity
ALDH2*1/*2	67	374	2.43	0.015	0.67	0.53–0.78
Typical weekend quantity
ALDH2*1/*2	67	374	2.59	0.010	0.67	0.53–0.78
Drinking frequency
ALDH2*1/*2	65	360.5	2.26	0.024	0.66	0.52–0.77

Only statistically significant tests are depicted. θ =0.5 indicates that the two compared distributions match perfectly. As the θ moves toward 1.0, the distributions are less and less similar. The confidence intervals (θ CI) indicate whether the effect size is reliably different from 0.5

U Mann–Whitney U statistic, θ theta, the effect size for a Mann–Whitney U test (Newcombe [50, 51])