2.3. Sample Size
Before conducting this study, the degree of decrease in eye–hand coordination between pre- and post-VDT operations was preliminarily examined. Consequently, a decrease of approximately 3% was observed. Based on this, we determined that the ingestion of our test food would result in a reduction of approximately 1% compared with the placebo, with a standard deviation of 1.5%. The sample size was calculated assuming 80% power and was evaluated in 29 subjects per group. Furthermore, considering the possibility of dropouts, the number of participants per group was planned to be 32.