Personality Statistics

Masahiko Nomi's data

Mr. Masahiko Nomi is a pioneer of blood-type personality in Japan.

The table below (table 18, pp.71) comes from on of his popular book "Shin ketsueki-gata ningen-gaku" (New blood type humanics) published in 1978.

Look at the results of a questionnaire to first-class Japanese athletes (exact dates were not specified).


Ratios of athletes who choose "Do the best for Japan" in a international game.


Blood type Number of persons Ratio
O 58 persons 13.8%
A 73 persons 13.7%
B 51 persons 9.8%
AB 22 persons 0.0%


The table shows the order of O=A>B>AB as expected.

To my surprise, the ratio of Type AB is zero! Type-AB people don't identify themselves with their country -- Japan.


The next data come from the same book (table 24, pp.211).

This time, the question is "Which do you feel best when eating with people?". Exact dates were not specified.


Ratios of people who choose "eat alone"


Blood type Number of persons Ratio
O 636 persons 20.1%
A 739 persons 19.6%
B 600 persons 23.2%
AB 428 persons 27.1%


The table shows the order of O=A<B<AB, too, as expected. Type-AB people like to be alone.   

Japanese University Students 1

At first, I will introduce an article of Ms. Yoriko Watanabe.


Watanabe, Y. (1994). The roles of prototype and exemplar in the formation of the "blood type stereotype". Shakai shinrigaku kenkyu [Social Psychology research]10-2, 77-86.



In this article, there seem little differences appear... so far.  But I noticed incidentally there might be great differences by blood types.  So, I decided to recalculate and the result is ...


Result by recalculation (Excerpts from Table 1: Relation between Correct Answer Rates of Each Questions and Blood Types)



Personality Traits

One's Own Blood Type
One's Own Blood Type χ2 p

Introvert, solve problem by oneself

.250 .658 16.50 p<0.001

Considerate, careful about everything

.563 .842 8.39 p<0.005


.344 .605 6.61 p<0.05

Esteem tatemae (principle) than honne (practice)


.658 5.31 p<0.05

Shaken easily

.130 .440 11.10 p<0.001

Warm hearted

.182 .360 3.43 p<0.10

Less influenced by the surroundings with going-my-way style

.325 .640 7.81 p<0.01
Optimistic .312 .520 3.54 p<0.10

Lack of prudence


.720 8.27 p<0.005
Fairy-tale like .133 .333 3.20 p<0.10
Rational thinking .200 .583 8.41 p<0.005
Cool and dry .478 .750 3.14 p<0.10
Capricious .089 .250 2.85 p<0.10
O (Not Siginficant)

p < 0.05 in bold 


The difference clearly came out.

It is natural because personality traits above are referred to Mr. Nomi's (and other researchers') blood-type books, not pulled out from psychology tests! 
As you may have noticed, these question items are famous characteristics.


There may be another reason.  Personality diagnosis by blood type is very popular in Japan.  As many as 70 percent of Japanese people think that there are (some) relationship between blood types and personality. 

Accordingly, in this case, as many as 70 percent of Japanese people would answer his/her personality that the person oneself is aware of -- in short, blood type's personality of the person oneself -- must be detected by these questions, whether there is "real" relationship between blood types and personality or not. 

Japanese University Students 2

The following data are presented by Mr. Ohmura. 

Subjects are 480 university students of Nihon University -- he is the professor of the university.


Are there characteristics of Type O? (%)    highest in red / lowest in blue



Type O
Type A
Type B
Type AB

1. Realistic thinking

54.8 57.8 63.5 55.6

2. Romanticist

65.2 68.5 66.3 75.6

3. Strong group unity

60.6 50.0 51.9 53.3

4. Strongly independent

49.0 51.9 60.6 55.6

5. Open one's mind to friends

82.6 75.5 79.8 68.9

6. Watch out it in the first meeting

58.7 58.3 58.7 62.2

7. Logical

39.4 34.7 36.4 33.3

8. Judge things by instinct

61.3 64.4 71.2 60.0


There appear only 10 - 20% differences, at most.  As you see, these differences are not larger than expected.  In this case, there is no statistically significant differences because question items were not blood-typical ones.


Source: "血の商人の餌食になるな-デタラメぶりは証明された" [Do not become a prey of merchants of blood], The Asahi Journal, March 8, 1985, pp. 89-92.