Sample size
alcohol-dependent
The estimated sample size was calculated using the G*Power 3.1.9.7 sample size calculator. Sample size calculation was based on Wilcoxon-Mann-Whitney test (two groups), whereby the type I error was 0.05, the power was 0.8, the allocation ratio was 1:1, and the effect size was set as 0.84, which was cited from a randomized trial that compared the efficacy of virtual reality therapy and general treatment in alleviating alcohol craving in alcohol-dependent patients [