did. This finding was consistent across all traits, and all differences were statistically significant. The same differences in scores were found in the groups who reported no blood type personality knowledge, although the values were smaller. Blood-type personality and the five-factor model The five-factor model tests were carried out in several countries, including Japan, Korea, and Taiwan, after the year 2000. These tests were intended to digitize self-ratings of the "big five" personality traits. It was expected that differences in self-reported personalities (a self-fulfilling prophecy) would be detected from the subject who believed in blood-typical stereotypes. As a result, researchers found no meaningful statistical difference. So Ho Cho, a Korean psychologist (Yonsei University), and the others carried out a questionnaire about blood-typical items to subjects and discovered statistical differences as expected. However, the difference was not found when the five-factor model for big five personality traits was administered to the same subjects. Another Korean researcher Sohn (Yonsei University) re-analyzed Cho's data. He found that several independent items of the big five personality test detected differences according to each blood-typical stereotype. However, these differences became extinct in the process of plural items being gathered to five factors (big five). If these results are correct, the five-factor model test cannot detect differences between the blood types – if such a causal link did indeed exist. In 2014, a Korean matchmaking company 듀오 Duo conducted a research survey closely examined 3,000 couples and found that blood type had no significant impact on the possibility of a couple getting married. In 2017, a meta-analysis of studies, using the Big Five personality test, involving 260,861 subjects found that six genes affected human personality. However, the coefficient of determination was as low as 0.04%. This is usually considered to be an error. Studies of blood distribution in various fields In order to avoid the influence of "contamination by knowledge", a Japanese psychologist group published a series of studies, but no significant differences were found except for Japanese prime ministers. Later, it was reported that significant differences were found not only for prime ministers, but also for foreign ministers, education ministers, professional baseball hitters, and soccer players in Japan. Brain waves and light topography Kim and Yi (Seoul University of Venture & Information) measured the brain waves of 4,636 adults. They reported that type O people were most stress-resistant. Moreover, an experiment using light topography instruments by