Note. The higher the level, the more informed.
Regardless of whether a person had knowledge of the characteristics of his/her blood type, the scores of characteristics for items that fit his/her blood type were higher than those of the other blood types. In both studies, the scores of characteristics which “did not fit” to one’s blood type in the “I know well” or “I know some” group were higher than those of characteristics “fit” to one’s blood type in the “I don’t know at all” (no-knowledge) group. In the no-knowledge group, scores of 4 out of 8 items were reversed in Survey 1, and 2 items out of all 12 were so in Survey 2. Thus, these items of Survey 2 were statistically significant in the binomial distribution at p = 0.019.

Analysis 3: Cross-tabulation of Knowledge, Extroversion and Sociability

According to the results obtained by a Japanese psychologist (Yamaoka, 2009), groups with more knowledge of blood type tended to be more interested in personality and other people. To confirm this, we investigated correlations by adding 3 items (Q1-m, n and o) in Survey 2. All 3 items were significant at p < 0.001 like Analysis 2; those with more knowledge were more likely to be extravert and sociable (Table 5).